This article is primarily about sexual intercourse in humans. For sexual intercourse among other animals, see
Animal sexual behaviour.
Sexual intercourse can play a strong role in
human bonding, often being used solely for pleasure and leading to stronger emotional bonds,
[8] and there are a variety of views concerning what constitutes sexual intercourse or other sexual activity.
[9] For example,
non-penetrative sex (such as non-penetrative
cunnilingus) has been referred to as "outercourse",
[10][11][12] but may also be among the
sexual acts contributing to human bonding and considered intercourse. The term
sex, often a shorthand for
sexual intercourse, can be taken to mean any form of sexual activity (i.e. all forms of intercourse and outercourse).
[6][9][13][14] Because individuals can be at risk of contracting
sexually transmitted diseases during these activities,
[15][16] although the transmission risk is significantly reduced during non-penetrative sex,
[11][17] safe sex practices are advised.
[15]
In human societies, some jurisdictions have placed various restrictive laws against certain sexual activities, such as sex with
minors,
incest,
extramarital sex,
position-of-trust sex,
prostitution,
sodomy,
public lewdness,
rape, and
bestiality.
Religious beliefs can play a role in decisions about sex, or its
purpose, as well; for example, beliefs about what sexual acts constitute
virginity loss or the decision to make a
virginity pledge.
[18][19][20] Some sections of
Christianity commonly view sex between a married couple for the purpose of reproduction as holy, while other sections may not.
[21] Modern
Judaism and
Islam view sexual intercourse between husband and wife as a spiritual and edifying action.
Hinduism and
Buddhism views on sexuality have differing interpretations.
Sexual intercourse between non-human animals is more often referred to as copulation; for most,
mating and copulation occurs at the point of
estrus (the most fertile period of time in the female's reproductive cycle),
[22][23] which increases the chances of
successful impregnation. However,
bonobos,
[24] dolphins,
[25] and
chimpanzees
are known to engage in sexual intercourse even when the female is not
in estrus, and to engage in sex acts with same-sex partners.
[25][26] Like humans engaging in sex primarily for pleasure,
[8] this behavior in the above mentioned animals is also presumed to be for pleasure,
[27] and a contributing factor to strengthening their social bonds.
[8]
Practices
Etymology, definitions, and stimulation factors
Sexual intercourse is also known as copulation, coitus or coition;
coitus is derived from the Latin word
coitio or
coire, meaning "a coming together or joining together" or "to go together" and is usually defined as penile-vaginal penetration.
[3][28][29][30] Penetration by the hardened, erect penis is additionally known as
intromission, or by the Latin name
immissio penis (Latin for "insertion of the penis").
Copulation, although usually used to describe the
mating process of non-human animals, is defined as "the transfer of the
sperm from male to female" or "the act of sexual procreation between a man and a woman".
[31][32] As such, common vernacular and research often limit sexual intercourse to penile-vaginal penetration, with
virginity loss being predicated on the activity,
[9][18][19][33] while the term
sex and phrase "having sex" commonly mean any sexual activity –
penetrative and
non-penetrative (intercourse and outercourse).
[9][13][34] The
World Health Organization states that non-English languages and cultures use different terms for sexual activity, with slightly different meanings.
[13]
Anal and
oral sex may be regarded as sexual intercourse,
[3][6][9] but they, as well as non-penetrative sex acts, may also be regarded as maintaining "
technical virginity" or as outercourse, regardless of any penetrative aspects.
[19][35] Heterosexual couples often engage in these practices not only for sexual pleasure, but as a way of avoiding
pregnancy and maintaining that they are virgins because they have not yet engaged in penile-vaginal sex.
[19][36][37][38] Likewise, some
gay men view
frotting
or oral sex as maintaining their virginity, with anal penetration
regarded as virginity loss, while other gay men consider frotting or
oral sex to be their main forms of intercourse.
[39][40][41][42] Lesbians may regard oral sex or
fingering as loss of virginity,
[43][44] and may also regard
tribadism as a primary form of sexual activity.
[2][45]
In 1999, a study by the
Kinsey Institute, published in
JAMA (the
Journal of the American Medical Association),
examined the definition of sex based on a 1991 random sample of 599
college students from 29 U.S. states; it reported that 60% said
oral-genital contact (
fellatio,
cunnilingus) did not constitute having sex.
[34][46] Similarly, a 2003 study published in the
Canadian Journal of Human Sexuality
focusing on definitions of having sex and noting studies concerning
university students from the United States, the United Kingdom, and
Australia reported that "[w]hile the vast majority of respondents (more
than 97%) in these three studies included penile-vaginal intercourse in
their definition of sex, fewer (between 70% and 90%) respondents
considered penile-anal intercourse to constitute having sex" and that
"oral-genital behaviours were defined as sex by between 32% and 58% of
respondents".
[9]
A different study by the Kinsey Institute sampled 484 people, ranging
in ages 18–96. "Nearly 95 percent of people in the study agreed that
penile-vaginal intercourse meant 'had sex.' But the numbers changed as
the questions got more specific." 11 percent of respondents based "had
sex" on whether the man had achieved an
orgasm,
concluding that absence of an orgasm does not constitute "having had"
sex. "About 80 percent of respondents said penile-anal intercourse meant
'had sex.' About 70 percent of people believed oral sex was sex."
[34]
Sexual activity can encompass a number of sexual behaviors, including different
sex positions[3][2][9] or the use of
sex toys.
Foreplay may precede certain sexual activities, and often leads to
sexual arousal of the partners, resulting in the
erection of the
penis or (usually) natural
lubrication of the vagina.
[47]
During coitus, both of the partners move their hips to move the penis
backward and forward inside the vagina to cause friction, typically
without fully removing the penis. In this way, they stimulate themselves
and each other, often continuing until orgasm in either or both
partners is achieved.
[28] For human females, stimulation of the
clitoris plays a significant role in sexual activity; 70–80% require direct clitoral stimulation to achieve orgasm,
[48][49][50][51] though indirect clitoral stimulation (for example, via vaginal intercourse) may also be sufficient (see
orgasm in females).
[52][53] As such, some couples may engage in the
woman on top position or the
coital alignment technique, a technique combining the "riding high" variation of the
missionary position
with pressure-counterpressure movements performed by each partner in
rhythm with sexual penetration, to maximize clitoral stimulation.
[1][3][54][55]
Anal sex involves stimulation of the
anus, anal cavity, sphincter valve or
rectum, mostly commonly employing the insertion of a man's penis into another person's rectum.
[56][57] Oral sex consists of all the sexual activities that involve the use of the tongue, rest of the mouth and throat to stimulate
genitalia.
It is sometimes performed to the exclusion of all other forms of sexual
activity, and may include the ingestion or absorption of semen or
vaginal fluids.
[10][58]
Fingering is the manual (genital) manipulation of the clitoris, vulva,
vagina, or anus for the purpose of sexual arousal and sexual
stimulation. It may constitute the entire sexual encounter or it may be
part of mutual masturbation, foreplay or other sexual activities.
[58][59]
Bonding and affection
In animals, copulation ranges from a purely
reproductive
activity to one of emotional bonding between mated pairs. Sexual
intercourse and other sexual activity typically plays a powerful role in
human bonding. For example, in many societies, it is normal for couples to have frequent intercourse while using some method of
birth control
(contraception), sharing pleasure and strengthening their emotional
bond through sexual activity even though they are deliberately avoiding
pregnancy.
[8]
In humans and
bonobos, the female undergoes relatively
concealed ovulation
so that both male and female partners commonly do not know whether she
is fertile at any given moment. One possible reason for this distinct
biological feature may be formation of strong emotional bonds between
sexual partners important for social interactions and, in the case of
humans, long-term partnership rather than immediate sexual reproduction.
[8]
Humans, bonobos,
dolphins, and
chimpanzees
are all intelligent social animals, whose cooperative behavior proves
significantly more successful than that of any individual alone. In
these animals, the use of sex has evolved beyond reproduction, to
apparently serve additional social functions.
[24][25][26]
Sex reinforces intimate social bonds between individuals to form larger
social structures. The resulting cooperation encourages collective
tasks that promote the survival of each member of the group.
[8]
Duration and sexual difficulties
Intercourse often ends when the man has ejaculated, and thus the partner might not have time to reach
orgasm. In addition,
premature ejaculation
(PE) is common, and women often require a substantially longer duration
of stimulation with a sexual partner than men do before reaching an
orgasm.
[47][60][61] Masters and Johnson
found that men took about 4 minutes to reach orgasm with their
partners; women took about 10–20 minutes to reach orgasm with their
partners, but 4 minutes to reach orgasm when they masturbated.
[47]
Scholars Weiten, Dunn and Hammer have reasoned, "Unfortunately, many
couples are locked into the idea that orgasms should be achieved only
through intercourse [penetrative vaginal sex]. Even the word
foreplay
suggests that any other form of sexual stimulation is merely
preparation for the 'main event.'... ...Because women reach orgasm
through intercourse less consistently than men, they are more likely
than men to have faked an orgasm."
[47]
In 1991, scholars June M. Reinisch and Ruth Beasley of the
Kinsey Institute
stated, "The truth is that the time between penetration and ejaculation
varies not only from man to man, but from one time to the next for the
same man." They added that the appropriate length for intercourse is the
length of time it takes for both partners to be mutually satisfied,
emphasizing that Kinsey "found that 75 percent of men ejaculated within
two minutes of penetration. But he didn't ask if the men or their
partners considered two minutes mutually satisfying" and "more recent
research reports slightly longer times for intercourse".
[62] A 2008 survey of Canadian and American
sex therapists
stated that the average time for intromission was 7 minutes and that 1
to 2 minutes was too short, 3 to 7 minutes was adequate and 7 to 13
minutes desirable, while 10 to 30 minutes was too long.
[63][64]
Anorgasmia
is regular difficulty reaching orgasm after ample sexual stimulation,
causing personal distress. This is much more common in women than in
men.
[61][65] The physical structure of the act of coitus favors penile stimulation over
clitoral
stimulation. The location of the clitoris then usually necessitates
manual stimulation in order for the female to achieve orgasm.
[47]
About 15% of women report difficulties with orgasm, 10% have never
climaxed, and 40–50% have either complained about sexual dissatisfaction
or experienced difficulty becoming sexually aroused at some point in
their lives. 75% of men and 29% of women always have orgasms with their
partner.
[66]
Vaginismus
is the involuntary tensing of the pelvic floor musculature, making
coitus distressing, painful, and sometimes impossible for women.
[65][67][68]
It is a conditioned reflex of the pubococcygeus muscle, sometimes
referred to as the "PC muscle". Vaginismus can be a vicious cycle for
women, they expect to experience pain during intercourse, which then
causes a muscle spasm, which leads to painful intercourse. Treatment of
vaginismus often includes both psychological and behavioral techniques,
including the use of
vaginal dilators. A new medical treatment using
Botox is in the testing phase.
[65][69] Some women also experience
dyspareunia, a medical term for painful or uncomfortable intercourse, of unknown cause.
[70][71]
About 40% of males suffer from some form of
erectile dysfunction (ED) or
impotence, at least occasionally.
[72] For those whose impotence is caused by medical conditions, prescription drugs such as
Viagra,
Cialis, and
Levitra
are available. However, doctors caution against the unnecessary use of
these drugs because they are accompanied by serious risks such as
increased chance of heart attack. Moreover, using a drug to counteract
the symptom—impotence—can mask the underlying problem causing the
impotence and does not resolve it. A serious medical condition might be
aggravated if left untreated.
[73]
Premature ejaculation is more common than erectile dysfunction.
"Estimates vary, but as many as 1 out of 3 men may be affected by
[premature ejaculation] at some time."
[60]
"Masters and Johnson speculated that premature ejaculation is the most
common sexual dysfunction, even though more men seek therapy for
erectile difficulties." This is because, "although an estimated 15
percent to 20 percent of men experience difficulty controlling rapid
ejaculation, most do not consider it a problem requiring help, and many
women have difficulty expressing their sexual needs".
[62] The
American Urological Association (AUA) estimates that premature ejaculation could affect 21 percent of men in the United States.
[74] The
Food and Drug Administration (FDA or USFDA) is examining the drug
dapoxetine
to treat premature ejaculation. In clinical trials, those with PE who
took dapoxetine experienced intercourse three to four times longer
before orgasm than without the drug. Another ejaculation-related
disorder is
delayed ejaculation, which can be caused as an unwanted side effect of antidepressant medications such as
Fluvoxamine.
[75][76]
Although
disability-related
pain and mobility impairment can hamper intercourse, in many cases the
most significant impediments to intercourse for individuals with a
disability are psychological.
[77] In particular, people who have a disability can find intercourse daunting due to issues involving their
self-concept as a sexual being,
[78][79] or partner's discomfort or perceived discomfort.
[77] Temporary difficulties can arise with
alcohol and sex as alcohol initially increases interest (through disinhibition) but decreases capacity with greater intake.
[80]
Reproduction, reproductive methods and pregnancy
Reproduction among humans usually occurs with penile-vaginal penetration.
[81] Male orgasm usually includes
ejaculation, a series of muscular
contractions that deliver
semen containing male gametes known as
sperm
cells or spermatozoa from the penis into the vagina. The subsequent
route of the sperm from the vault of the vagina is through the
cervix and into the
uterus, and then into the
fallopian tubes. Millions of sperm are present in each ejaculation, to increase the chances of one fertilizing an egg or
ovum (see
sperm competition). When a fertile ovum from the female is present in the fallopian tubes, the male gamete joins with the ovum, resulting in
fertilization and the formation of a new
embryo. When a fertilized ovum reaches the uterus, it becomes implanted in the lining of the uterus – known as the
endometrium – and a
pregnancy begins.
[81] Unlike most species, human sexual activity is not linked to periods of
estrus and can take place at any time during the reproductive cycle, even during pregnancy.
[82] Where a
sperm donor
has sexual intercourse with a woman who is not his partner, for the
sole purpose of impregnating the woman, this may be known as natural
insemination, as opposed to
artificial insemination. However, most sperm donors donate their sperm through a
sperm bank and pregnancy is achieved through artificial insemination.
[83]
Artificial insemination is performed with the express intention of
attempting to impregnate the female, and to this extent, its purpose is
the medical equivalent of sexual intercourse.
In 2005, the
World Health Organization
(WHO) estimated that 123 million women become pregnant world-wide each
year, and around 87 million of those pregnancies or 70.7% are
unintentional. About 46 million pregnancies per year reportedly end in
induced
abortion.
[84]
About 6 million U.S. women become pregnant per year. Out of known
pregnancies, two-thirds result in live births and roughly 25% in
abortions; the remainder end in miscarriage. However, many more women
become pregnant and miscarry without even realizing it, instead
mistaking the miscarriage for an unusually heavy
menstruation.
[85] The U.S.
teenage pregnancy
rate fell by 27 percent between 1990 and 2000, from 116.3 pregnancies
per 1,000 girls aged 15–19 to 84.5. This data includes live births,
abortions, and fetal losses. Almost 1 million American teenage women,
10% of all women aged 15–19 and 19% of those who report having had
intercourse, become pregnant each year.
[86] Britain has been stated to have a teenage pregnancy rate similar to America's.
[87]
Reproductive methods and pregnancy also extend to gay and lesbian couples. For gay male pairings, there is the option of
surrogate pregnancy; for lesbian couples, there is donor insemination in addition to choosing surrogate pregnancy.
[88][89]
Further, developmental biologists have been researching and developing
techniques to facilitate biological same-sex reproduction, though this
has yet to be demonstrated in humans (see
same-sex reproduction).
[90][91]
Surrogacy and donor insemination remain the primary methods. Surrogacy
is an arrangement in which a woman carries and delivers a child for
another couple or person. The woman may be the child's genetic mother
(traditional surrogacy) or she may carry a pregnancy to delivery after
having another woman's eggs transferred to her uterus (gestational
surrogacy). Gay and lesbian pairings who want the host to have no
genetic connection to the child may choose gestational surrogacy and
enter into a contract with an
egg donor. Gay male couples might decide that they should both contribute semen for the
in vitro fertilisation (IVF) process, which further establishes the couple's joint intention to become parents.
[89]
Lesbian couples often have contracts drafted to extinguish the legal
rights of the sperm donor, while creating legal rights for the parent
who is not biologically related to the child.
[92]
Safe sex, contraception, and prevalence of sexual activity
According to a national survey conducted in the U.S. in 1995, at
least 3/4 of all men and women in the U.S. have had intercourse by their
late teenage years, and more than 2/3 of all sexually experienced teens
have had 2 or more partners.
[96] In 2004, the
Guttmacher Institute
indicated in 2002 that 62% of the 62 million women aged 15–44 are
currently using a contraceptive method, that among U.S. women who
practice contraception,
the Pill
is the most popular choice (30.6%), followed by tubal sterilization
(27.0%) and the male condom (18.0%), and that 27% of teenage women using
contraceptives choose condoms as their primary method.
[97] A 2006
Kaiser Family Foundation
report stated that among sexually active 15- to 19-year-olds in the
U.S., 83% of females and 91% of males reported using at least one method
of birth control during last intercourse.
[98]
A 2006 survey conducted by
The Observer
suggested that most adolescents in Britain were waiting longer to have
sexual intercourse than they were only a few years earlier.
[99]
In 2002, it was reported that 32% of British teenagers were having sex
before the age of 16, while, in 2006, it was only 20%. The average age a
British teenager lost his/her virginity was reportedly 17.13 years in
2002; in 2006, it was 17.44 years on average for girls and 18.06 for
boys. The most notable drop among teens who reported having sex was 14-
and 15-year-olds.
[99] A 2008 survey conducted by
YouGov for
Channel 4
suggested that 40% of all 14- to 17-year-olds are sexually active, 74%
of sexually active 14- to 17-year-olds have had a sexual experience
under the age of consent, and 6% of teens would wait until marriage
before having sex.
[100]
The
National Survey of Sexual Health and Behavior
(NSSHB) indicated in 2010 that 1 of 4 acts of vaginal intercourse are
condom-protected in the U.S. (1 in 3 among singles), condom use is
higher among black and Hispanic Americans than among white Americans and
those from other racial groups, and adults using a condom for
intercourse were just as likely to rate the sexual extent positively in
terms of arousal, pleasure and orgasm than when having intercourse
without one.
[101]
Health effects
Benefits
In humans, sexual activity has been claimed to produce health benefits as varied as improved sense of smell,
[102] stress and blood pressure reduction,
[103][104] increased
immunity,
[105] and decreased risk of
prostate cancer.
[106][107][108] Sexual intimacy, as well as orgasms, increases levels of the hormone
oxytocin, also known as "the love hormone", which helps people bond and build trust.
[109][110][111] Sex is also known as one of many
mood repair strategies, which means it can be used to help dissipate feelings of sadness or depression.
[112] A long-term study of 3,500 people between 30 and 101 by clinical
neuropsychologist
David Weeks, MD, head of old age psychology at the Royal Edinburgh
Hospital in Scotland, found that "sex helps you look between four and
seven years younger", according to impartial ratings of the subjects'
photos. Exclusive causation, however, is unclear, and the benefits may
be indirectly related to sex and directly related to significant
reductions in stress, greater contentment, and better sleep that sex
promotes.
[113][114][115]
Risks
Sexually transmitted infections
(STIs) can be spread by person-to-person sexual contact, including
sexual intercourse. There are 19 million new cases of sexually
transmitted diseases every year in the U.S.,
[116]
and, in 2005, the World Health Organization estimated that 448 million
people aged 15–49 were being infected a year with curable STIs such as
syphilis,
gonorrhoea and
chlamydia.
[117] In 2006,
The Independent
newspaper reported that the biggest rise in sexually transmitted
infections was in syphilis, which rose by more than 20%, while increases
were also seen in cases of
genital warts and
herpes.
[118]
STIs are caused by
bacteria,
viruses and
parasites, which are passed from person to person during
sexual contact. Some, in particular
HIV and syphilis, can also be passed in other ways including from mother to child during pregnancy and
childbirth, through
blood products, and by shared
hypodermic needles.
[117] Gonococcal or chlamydial infections often produce no symptoms at all. Untreated chlamydial infection can lead to female infertility and
ectopic pregnancy.
Human papillomavirus can lead to genital and
cervical cancers.
Syphilis can result in
stillbirths and neonatal deaths. Untreated gonococcal infections result in
miscarriages,
preterm births, and
perinatal deaths. Infants born to mothers with untreated gonorrhoea or chlamydia can develop
serious eye infections, which can lead to blindness.
[117] Hepatitis B can also be transmitted through sexual contact.
[119] Globally, there are about 350 million chronic carriers of hepatitis B.
[120]
Some STIs can cause
ulceration, but even if they do not, they increase the risk of both acquiring and passing on HIV up to ten-fold.
[117]
HIV is one of the world's leading infectious killers, and, in 2010,
approximately 30 million people were estimated to have died because of
it since the beginning of the epidemic. Of the 2.7 million new
HIV infections estimated to occur worldwide in 2010, 1.9 million (70%) were in
Africa.
"The estimated 1.2 million Africans who died of HIV-related illnesses
in 2010 comprised 69% of the global total of 1.8 million deaths
attributable to the epidemic."
[121] It is diagnosed by
blood tests, and while no cure has been found, it can be controlled with
antiretroviral drugs, and patients can enjoy healthy and productive lives.
[122]
The most effective way to avoid sexually transmitted infections is to abstain from sexual intercourse, including
oral,
vaginal, and
anal sex, or to have sexual intercourse only with one long-term, uninfected partner, who also remains entirely
monogamous.
The World Health Organization says that "Male latex condoms, when used
consistently and correctly, are highly effective in reducing the
transmission of HIV and other sexually transmitted infections, including
gonorrhoea, chlamydial infection and
trichomoniasis."
[117] In cases where infection is suspected, early medical intervention is highly beneficial in all cases.
People, especially those who get little or no physical exercise, have a slightly increased risk of triggering
heart attack or
sudden cardiac death
when they engage in sexual intercourse, or any other vigorous physical
exercise which is engaged in on a sporadic basis. Increased risk is
temporary with incidents occurring within a few hours of the activity.
Regular exercise reduces but does not eliminate the increased risk.
[123]
Social effects
Adults
Alex Comfort
and others posit three potential advantages of intercourse in humans,
which are not mutually exclusive: reproductive, relational, and
recreational.
[8][124] While the development of
the Pill and other highly effective forms of
contraception
in the mid- and late 20th century increased people's ability to
segregate these three functions, they still overlap a great deal and in
complex patterns. For example: A fertile couple may have intercourse
while contracepting not only to experience sexual pleasure
(recreational), but also as a means of emotional intimacy (relational),
thus deepening their bonding, making their relationship more stable and
more capable of sustaining children in the future (deferred
reproductive). This same couple may emphasize different aspects of
intercourse on different occasions, being playful during one episode of
intercourse (recreational), experiencing deep emotional connection on
another occasion (relational), and later, after discontinuing
contraception, seeking to achieve pregnancy (reproductive, or more
likely reproductive and relational).
[124]
Nearly all Americans marry during their lifetime; yet close to half
of all first marriages are expected to end in separation or divorce,
many within a few years,
[125] and subsequent marriages are even more likely to end.
[126] Sexual dissatisfaction is associated with increased risk of divorce and relationship dissolution.
[126]
According to the
National Survey of Sexual Health and Behavior
(NSSHB), in 2010, men whose most recent sexual encounter was with a
relationship partner reported greater arousal, greater pleasure, fewer
problems with erectile function,
orgasm, and less pain during the event than men whose last sexual encounter was with a non-relationship partner.
[101] According to the
Journal of Counseling & Development,
many women express that their most satisfying sexual experiences entail
being connected to someone, rather than solely basing satisfaction on
orgasm.
[127]
Adolescents
With regard to
adolescent sexuality, sexual intercourse is often for relational and recreational purposes as well. However,
teenage pregnancy is usually disparaged, and research suggests that the
earlier onset of puberty for children puts pressure on children and teenagers to act like adults before they are emotionally or cognitively ready,
[128][129] and thus are at risk to suffer from
emotional distress as a result of their sexual activities.
[129][130][131][132][133]
Some studies have concluded that engaging in sex leaves adolescents,
and especially girls, with higher levels of stress and depression.
[134] A majority of adolescents in the
United States have been provided with some information regarding sexuality,
[135] though there have been efforts among social conservatives in the United States government to limit
sex education in public schools to
abstinence-only sex education curricula.
[136]
One group of
Canadian
researchers found a relationship between self-esteem and sexual
activity. They found that students, especially girls, who were verbally
abused by teachers or rejected by their peers were more likely than
other students to engage in sex by the end of the Grade 7. The
researchers speculate that low self-esteem increases the likelihood of
sexual activity: "low self-esteem seemed to explain the link between
peer rejection and early sex. Girls with a poor self-image may see sex
as a way to become 'popular', according to the researchers".
[137]
In
India,
there is growing evidence that adolescents are becoming more sexually
active outside of marriage, which is feared to lead to an increase in
the spread of
HIV/AIDS among adolescents, as well as the number of unwanted pregnancies and
abortions,
and add to the conflict between contemporary social values. In India,
adolescents have relatively poor access to health care and education,
and with cultural norms opposing extramarital sexual behavior, "these
implications may acquire threatening dimensions for the society and the
nation".
[138]
Not all views on adolescent sexual behavior are negative, however. Psychiatrist
Lynn Ponton
writes, "All adolescents have sex lives, whether they are sexually
active with others, with themselves, or seemingly not at all," and that
viewing adolescent sexuality as a potentially positive experience,
rather than as something inherently dangerous, may help young people
develop healthier patterns and make more positive choices regarding sex.
[128]
Likewise, others state that long-term romantic relationships allow
adolescents to gain the skills necessary for high-quality relationships
later in life
[139]
and develop feelings of self-worth. Overall, positive romantic
relationships among adolescents can result in long-term benefits.
High-quality romantic relationships are associated with higher
commitment in early adulthood
[140] and are positively associated with self-esteem, self-confidence, and social competence.
[141][142]
Ethical, religious, and legal views
Erotic painting from India, 18th century. Prince and lady on terrace at night Rajasthan 1790 miniature
Erotic painting on ancient Greek kylix scene. Pedieus Painter: of an Attic red-figure kylix, c. 510 BC.
Louvre. Department of Greek, Etruscan and Roman Antiquities, Sully, 1st floor, room 43, case 4.
Campana Collection, 1861 Beazley, Attic Red-figured Vase-Painters (1963), 86, a.
While sexual intercourse is the natural mode of reproduction for the
human species, humans have intricate moral and ethical guidelines which
regulate the practice of sexual intercourse and vary according to
religious
and governmental laws. Some governments and religions also have strict
designations of "appropriate" and "inappropriate" sexual behavior, which
include restrictions on the types of sex acts which are permissible. A
historically prohibited or regulated sex act is anal sex.
[143][144]
Consent and sexual offenses
Sexual intercourse with a person against their will, or without their
informed legal consent, is
rape, and is considered a serious
crime in most countries.
[145] More than 90% of rape victims are female, 99% of rapists male, and only about 5% of rapists are strangers to the victims.
[146]
Most developed countries have
age of consent
laws specifying the minimum legal age a person may engage in sexual
intercourse with substantially older persons, usually set at about
16–18, while the legal age of consent ranges from 12–20 years of age or
is not a matter of law in other countries.
[147] Sex with a person under the age of consent, regardless of their stated consent, is often considered to be
sexual assault or
statutory rape depending on differences in ages of the participants.
Some countries codify rape as any sex with a person of diminished or
insufficient mental capacity to give consent, regardless of age.
[148]
The expression "sexual intercourse" has been used as a term of art in
England and Wales and
New York State. In England and Wales, from its enactment to its repeal on the 1 May 2004,
[149] section 44 of the
Sexual Offences Act 1956 read:
Where, on the trial of any offence under this Act,
it is necessary to prove sexual intercourse (whether natural or
unnatural), it shall not be necessary to prove the completion of the
intercourse by the emission of seed, but the intercourse shall be deemed
complete upon proof of penetration only.
- Unnatural
This expression refers to
buggery, including both buggery with a person and buggery with an animal.
[150] Zoophilia
(bestiality) is sexual activity between humans and non-human animals or
a preference for or fixation on such practice. People who practice
zoophilia are known as zoophiles,
[151] zoosexuals, or simply "zoos".
[152] Zoophilia may also be known as zoosexuality.
[152] Zoophilia is a
paraphilia.
[153][154][155][156] Sex with animals is not outlawed in some jurisdictions, but, in most countries, it is illegal under
animal abuse laws or laws dealing with
crimes against nature.
- Penetration
According to cases decided on the meaning of the statutory definition of
carnal knowledge under the
Offences against the Person Act 1828, which was in identical terms to this definition, the slightest penetration was sufficient.
[157] The book "Archbold" said that it "submitted" that this continued to be the law under the new enactment.
[158]
- Continuing act
See Kaitamaki v R [1985] AC 147, [1984] 3 WLR 137, [1984] 2 All ER 435, 79 Cr App R 251, [1984] Crim LR 564,
PC (decided under equivalent legislation in New Zealand).
Section 7(2) of the
Sexual Offences (Amendment) Act 1976
contained the following words: "In this Act . . . references to sexual
intercourse shall be construed in accordance with section 44 of the
Sexual Offences Act 1956 so far as it relates to natural intercourse
(under which such intercourse is deemed complete on proof of penetration
only)". The Act made provision, in relation to rape and related
offences, for England and Wales, and for courts-martial elsewhere.
From 3 November 1994 to 1 May 2004, section 1(2)(a) of the Sexual Offences Act 1956 (as substituted by section 142 of the
Criminal Justice and Public Order Act 1994) referred to "sexual intercourse with a person (whether vaginal or anal)". This section created the offence of
rape in England and Wales.
The penal code in New York State provides: § 130.00 Sex offenses;
definitions of terms: 1. "Sexual intercourse" has its ordinary meaning
and occurs upon any penetration, however slight.
[159]
Romantic relationships
Sexual orientation and gender
There is considerable legal variability regarding definitions of and
the legality of sexual intercourse between persons of the same sex or
gender. For example, in 2003 the
New Hampshire Supreme Court ruled that female same-sex relations did not constitute
sexual intercourse, based on a 1961 definition from
Webster's Third New International Dictionary, in
Blanchflower v. Blanchflower, and thereby an accused wife in a divorce case was found not guilty of
adultery based on this technicality. Some countries, such as
Islamic countries, consider homosexual behavior to be an offense punishable by imprisonment or execution.
[160]
Marriage and relationships
Sexual intercourse has traditionally been considered an essential part of a
marriage; many religious customs required
consummation of the marriage by sexual intercourse, and the failure for any reason to consummate the marriage was a ground for
annulment,
which did not require a divorce process. Annulment declaration implied
that the marriage was void from the start – i.e. there was in law no
marriage. Furthermore, continuing sexual relations between the marriage
partners is commonly considered a 'marital right' by many religions,
permissible to married couples, generally for the purpose of
reproduction. Today, there is wide variation in the opinions and
teachings about sexual intercourse relative to marriage and other
intimate relationships by the world's religions. Examples:
- Most denominations of Christianity, including Catholicism,[21] have strict views or rules on what sexual practices are acceptable or, more specifically, what are not.[161] Most Christian views on sex are formed or influenced by various interpretations of the Bible.[162] Sex outside of marriage is considered a sin
in some churches, and sex may be referred to as a "sacred covenant"
between husband and wife. Historically, Christian teachings often
promoted celibacy,[163] although today usually only certain members (for example certain religious leaders)
of some groups take a vow of celibacy, forsaking both marriage and any
type of sexual or romantic activity. Some Christians view sex,
particularly sexual intercourse between a married couple, as "holy" or a
"holy sacrament".[21][163]
Some Christians interpret the Bible to forbid the "misuse of sexual
organs" and take that to mean that only penile/vaginal penetrative
intercourse is acceptable, while some argue that the Bible is not clear
on oral sex and that it is a personal decision as to whether its
acceptable within marriage.[164]
- In The Church of Jesus Christ of Latter-day Saints, or Mormonism,
sexual relations within the bonds of matrimony are seen as beautiful
and sacred. Mormons consider sexual relations to be ordained of God for
the creation of children and for the expression of love between husband
and wife. Members are encouraged to not have any sexual relations before
marriage, and be completely faithful to their spouse after marriage.[165]
- In Judaism, a married Jewish man is required to provide his wife with sexual pleasure called onah (literally, "her time"), which is one of the conditions he takes upon himself as part of the Jewish marriage contract, ketubah, that he gives her during the Jewish wedding ceremony. In Jewish views on marriage, sexual desire is not evil, but must be satisfied in the proper time, place and manner.[166]
- Islam views sex within marriage as something pleasurable, a spiritual activity, and a duty.[167][168][169]
In Shi'ia Islam, men are allowed to enter into an unlimited number of
temporary marriages, which are contracted to last for a period of
minutes to multiple years and permit sexual intercourse. Shi'ia women
are allowed to enter only one marriage at a time, whether temporary or
permanent.
- Wiccans believe that, as declared within the Charge of the Goddess, to "Let my [the Goddess] worship be within the heart that rejoiceth; for behold, all acts of love and pleasure are my rituals." This statement appears to allow one freedom to explore sensuality and pleasure, and mixed with the final maxim within the Wiccan Rede – "26. Eight words the Wiccan Rede fulfill – an’ it harm none, do what ye will."[170] – Wiccans are encouraged to be responsible with their sexual encounters, in whatever variety they may occur.[171]
- Hinduism has varied views about sexuality, but Hindu society, in general, perceives extramarital sex to be immoral and shameful.[167]
- Buddhist ethics, in its most common formulation, holds that one should neither be attached to nor crave sensual pleasure.
- In the Bahá'í Faith, sexual relationships are permitted only between a husband and wife.[172]
- Unitarian Universalists,
with an emphasis on strong interpersonal ethics, do not place
boundaries on the occurrence of sexual intercourse among consenting
adults.[173]
- According to the Brahma Kumaris and Prajapita Brahma Kumaris religion, the power of lust is the root of all evil and worse than murder.[174] Purity (celibacy)
is promoted for peace and to prepare for life in forthcoming Heaven on
earth for 2,500 years when children will be created by the power of the
mind.[175][176]
- Shakers
believe that sexual intercourse is the root of all sin and that all
people should therefore be celibate, including married couples.
Predictably, the original Shaker community that peaked at 6,000 full
members in 1840 dwindled to three members by 2009.[177]
In some cases, the sexual intercourse between two people is seen as
counter to religious law or doctrine. In many religious communities,
including the
Catholic Church and
Mahayana Buddhists,
religious leaders are expected to refrain from sexual intercourse in
order to devote their full attention, energy, and loyalty to their
religious duties.
[178]
Opposition to
same-sex marriage is largely based on the belief that sexual intercourse and sexual orientation should be of a heterosexual nature.
[179][180][181][182]
The recognition of such marriages is a civil rights, political, social,
moral, and religious issue in many nations, and the conflicts arise
over whether same-sex couples should be allowed to enter into marriage,
be required to use a different status (such as a civil union, which
either grant equal rights as marriage or limited rights in comparison to
marriage), or not have any such rights. A related issue is whether the
term
marriage should be applied.
[164][183][184]
In other animals
In zoology,
copulation is often termed as the process in which a male introduces
sperm into the female's body.
Spiders have separate male and female sexes. Before mating and copulation, a male spins a small web and
ejaculates on to it. He then stores the sperm in reservoirs on his large
pedipalps, from which he transfers sperm to the female's genitals. Females can store sperm indefinitely.
[185]
Many animals which live in the water use
external fertilization, whereas
internal fertilization may have developed from a need to maintain
gametes in a liquid medium in the
Late Ordovician epoch. Internal fertilization with many vertebrates (such as
reptiles, some
fish, and most
birds) occur via
cloacal copulation (see also
hemipenis), while
mammals copulate
vaginally, and many
basal vertebrates reproduce sexually with external fertilization.
However, some
terrestrial arthropods do use external fertilization. For primitive
insects, the male deposits
spermatozoa on the substrate, sometimes stored within a special structure, and
courtship
involves inducing the female to take up the sperm package into her
genital opening; there is no actual copulation. In groups such as
dragonflies
and spiders, males extrude sperm into secondary copulatory structures
removed from their genital opening, which are then used to inseminate
the female (in dragonflies, it is a set of modified
sternites on the second abdominal segment; in spiders, it is the male
pedipalps). In advanced groups of insects, the male uses its
aedeagus,
a structure formed from the terminal segments of the abdomen, to
deposit sperm directly (though sometimes in a capsule called a "
spermatophore") into the female's reproductive tract.
Humans, bonobos,
[24] chimpanzees and dolphins
[25]
are species known to engage in heterosexual behaviors even when the
female is not in estrus, which is a point in her reproductive cycle
suitable for successful impregnation. These species, and others, are
also known to engage in homosexual behaviors.
[26]
Humans, bonobos and dolphins are all intelligent social animals, whose
cooperative behavior proves far more successful than that of any
individual alone. In these animals, the use of sex has evolved beyond
reproduction, to apparently serve additional social functions. Sex
reinforces intimate social bonds between individuals to form larger
social structures. The resulting cooperation encourages collective tasks
that promote the survival of each member of the group.
[8]
See also
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The majority of women enjoy a light caressing of the shaft of the
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