Anal sex or anal intercourse is generally the insertion and thrusting of the erect penis into a person's anusor anus and rectumfor sexual pleasure. While anal sex is commonly associated with male homosexualityresearch shows that not all gay males engage in anal sex and that it is not uncommon in heterosexual relationships. Anal sex is considered a high-risk sexual practice because of the vulnerability of the anus and rectum.
The anal and rectal tissues are delicate and do not provide lubrication like the vagina doesso they can easily tear and permit disease transmission, especially if a personal lubricant is not used. Strong views are often expressed about Internal view of anal penetration sex. It is controversial in various cultures, especially with regard to religious prohibitions. This is commonly due to prohibitions against anal sex among males or teachings about the procreative purpose of sexual activity.
They may regard it as an enhancing element of their sex lives or as their primary form of sexual activity. The abundance of nerve endings in the anal region and rectum can make anal sex pleasurable for men or women. An Encyclopedia states that "the inner third of the anal canal is less sensitive to touch than the outer two-thirds, but is more sensitive to pressure" and that "the rectum is a curved tube about eight or nine inches long and has the capacity, Internal view of anal penetration the anus, to expand".
Research indicates that anal sex occurs significantly less frequently than other sexual behaviors,  but its association with dominance and submissionas well as taboomakes it an appealing stimulus to people of all sexual orientations.
In a male receptive partnerbeing anally penetrated can produce a pleasurable sensation due to the inserted penis rubbing or brushing against the prostate also known as the "male G-spot" through the anal wall. The clitoris is composed of more than the externally visible glans head. Internal view of anal penetration its glans or body as a whole estimated to have around 8, sensory nerve endings,   the clitoris surrounds the vagina and urethra and may have a similar connection with the anus.
Stimulation from anal sex can additionally be affected by popular perception or portrayals of the activity, such as erotica or pornography. In pornography, anal sex is commonly portrayed as a desirable, painless routine that does not require personal lubricant ; this can result in couples performing anal sex without care, and men and women believing that it is unusual for women, as receptive partners, to find discomfort or pain instead of pleasure from the activity.
Researchers say adequate application of a personal lubricant, relaxation, and communication between sexual partners are crucial to avoid pain or damage to the anus or rectum. The anal sphincters are usually tighter than the pelvic muscles of the vagina, which can enhance the sexual pleasure for Internal view of anal penetration inserting male during male-to-female anal intercourse because of the pressure applied to the penis.
While some women find being a receptive partner during anal intercourse painful or uncomfortable, or only engage in the act to please a male sexual partner, other women find the activity pleasurable or prefer it to vaginal intercourse.
In a clinical review article of heterosexual anal sex, anal intercourse is used to specifically denote penile-anal penetration, and anal sex is used to denote any form of anal sexual activity. The review suggests that anal sex is exotic among the sexual practices of some heterosexuals and that "for a certain number of heterosexuals, anal intercourse is pleasurable, exciting, and perhaps considered more intimate than vaginal sex".
Anal intercourse is sometimes used as a substitute for vaginal intercourse during menstruation.
Because of this, some couples practice anal intercourse as a form of contraceptionoften in the absence of a condom. Male-to-female anal sex is commonly viewed as a way Internal view of anal penetration preserving female virginity because it is non-procreative and does not tear the hymen ; a person, especially a teenage girl or woman, who engages in anal sex or other sexual activity with no history of having engaged in vaginal intercourse is often regarded among heterosexuals and researchers as not having yet experienced virginity loss.
This is sometimes called technical virginity. Carpenter stated that this view "dates to the late s, with explicit 'rules' appearing around the turn of the twentieth century, as in marriage manuals defining petting as 'literally every caress known to married couples but does not include complete sexual intercourse.
Because most research on anal intercourse addresses men who have sex with menlittle data exists on the prevalence of anal intercourse among heterosexual couples.
McBride's clinical review on heterosexual anal intercourse and other forms of anal sexual activity, it is suggested that changing Internal view of anal penetration may affect the frequency of heterosexual anal sex. As a result, we do not know the extent to which anal intercourse differs qualitatively from coitus. Women engaged in anal intercourse less commonly than men. With regard to adolescents, limited data also exists. This may be because of the taboo nature of anal sex and that teenagers and caregivers subsequently avoid talking to one Internal view of anal penetration about the topic.
It is also common for subject review panels and schools to avoid the subject. A study found that They used condoms during anal sex Anal sex being more common among heterosexuals today than it was previously has been linked to the increase in consumption of anal pornography among men, especially among those who view it on a regular basis. Historically, anal sex has been commonly associated with male homosexuality. However, many gay men and men who have sex with men in general those who identify as gay, bisexualheterosexual or have not identified their sexual identity do not engage in anal sex.
Those who enjoy either role may be referred to as versatile. Gay men who prefer anal sex may view it as their version of intercourse and a natural expression of intimacy that Internal view of anal penetration capable of providing pleasure.
Men who have sex with men may also prefer to engage in frot or other forms of mutual masturbation because they find it more pleasurable or more affectionate, to preserve technical virginityor as safe sex alternatives to anal sex,    while other frot advocates denounce anal sex as degrading to the receptive partner and unnecessarily risky.
Reports regarding the prevalence of anal sex among gay men and other men who have sex with men vary.
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Oral sex and mutual masturbation are more common than anal stimulation among men in sexual relationships with other men. Women may sexually stimulate a man's anus by fingering the exterior or interior areas of the anus; they may also Internal view of anal penetration the perineum which, for males, is between the base of the scrotum and the anusmassage the prostate or engage in anilingus.
Commonly, heterosexual men reject the idea of being receptive partners during anal sex because they believe it is a feminine act, can make them vulnerable, or contradicts their sexual orientation for example, that it is indicative that they are gay. There are little published data on how many heterosexual men would Internal view of anal penetration their anus to be sexually stimulated in a heterosexual relationship. Anecdotally, it is a substantial number. What data we do have almost all relate to penetrative sexual acts, and the superficial contact of the anal ring with fingers or the tongue is even less well documented but may be assumed to be a common sexual activity for men of all sexual orientations.
With regard to lesbian sexual practicesanal sex includes fingering, use of a dildo or other sex toys, Internal view of anal penetration anilingus. There is less research on anal sexual activity among women who have sex with women compared to couples of other sexual orientations. Ina non-scientific study Munson was conducted of more than members of a lesbian social organization in Colorado.
When asked what techniques they used in their last ten sexual encounters, lesbians in their 30s were twice as likely as other age groups to engage in anal stimulation with a finger or dildo. Anal sex can expose its participants to two principal dangers: As with other sexual practices, people without sound knowledge about the sexual risks involved are susceptible to STIs.
Because of the view that anal sex is not "real sex" and therefore does not result in virginity loss, or pregnancy, teenagers and other young people may consider vaginal intercourse riskier than anal intercourse and believe that a STI can only result from vaginal intercourse. Although anal sex alone does not lead to pregnancy, pregnancy can still occur with anal sex or other forms of sexual activity if the penis is near the vagina such as during intercrural sex or other genital-genital rubbing and its sperm is deposited near the vagina's entrance and travels along the vagina's lubricating fluids; the risk of pregnancy can also occur without the penis being near the vagina because sperm may be transported to the vaginal opening by the vagina coming in contact with fingers or other non-genital body parts that have come in contact with semen.
There are a variety of factors that make male-to-female anal intercourse riskier for a female than for a male. For example, besides the risk of HIV transmission being higher for anal intercourse than for vaginal intercourse,    the risk of injury to the woman during anal intercourse is significantly higher than the risk of injury to her during vaginal intercourse because of the durability of the vaginal tissues compared to the anal tissues. Pain during receptive anal sex among gay men or men who have sex with men is Internal view of anal penetration known as anodyspareunia.
Research has found that psychological factors can in fact be the primary contributors to the experience of pain during anal intercourse and that adequate communication between sexual partners can prevent it, countering the notion that pain is always inevitable during anal sex.
Unprotected anal sex is a risk factor for formation of antisperm antibodies ASA in the recipient. In some people, ASA may cause autoimmune infertility. Anal sex can exacerbate hemorrhoids and therefore result in bleeding; in other Internal view of anal penetration, the formation of a hemorrhoid is attributed to anal sex.
Repetitive penetrative anal sex may result in the anal sphincters becoming weakened, which may cause rectal prolapse or affect the ability to hold in feces a condition known as fecal incontinence. Most cases of anal cancer are related to infection with the human papilloma virus HPV.
Anal sex alone does not cause anal cancer; the risk of Internal view of anal penetration cancer through anal sex is attributed to HPV infection, which is often contracted through unprotected anal sex. Because of this, men who have sex with men have a high risk of this cancer.
Different cultures have had different views on anal sex throughout human history, with some cultures more positive about the activity than others.
Anal sex has been more accepted in modern times; it is often considered a natural, pleasurable form of sexual expression. From the earliest records, the ancient Sumerians had very relaxed attitudes toward sex  and did not regard anal sex as taboo.
The term Greek love has long been used to refer to anal intercourse, and in modern times, "doing it the Greek way" is sometimes used Internal view of anal penetration slang for anal sex. Male-male anal sex Internal view of anal penetration not a universally accepted practice in Ancient Greece; it was the target of jokes in some Athenian comedies. Greek artwork of sexual interaction between men and boys usually depicted fondling or intercrural sexwhich was not condemned for violating or feminizing boys,  while male-male anal intercourse was usually depicted between males of the same age-group.
In later Roman-era Greek poetryanal sex became a common literary convention, represented as taking place with "eligible" youths: Seducing those not of proper age for example, non-adolescent children into the practice was considered very shameful for the adult, and having such relations with a male who was no longer adolescent was considered more shameful for the young male than for the one mounting him; Greek courtesans, or hetaeraeare said to have frequently practiced male-female anal intercourse as a means of preventing pregnancy.
A male citizen taking the passive or receptive role in anal intercourse paedicatio in Latin was condemned in Rome as an act of impudicitia immodesty or un chastity ; free men, however, frequently took the active role with a young male slave, known as a catamite or puer delicatus. The latter was allowed because anal intercourse was considered equivalent to vaginal intercourse in this way; men were said to "take it like a woman" muliebria pati, "to undergo womanly things" when they were anally penetrated, but when a man performed anal sex on a woman, she was thought of as playing the boy's role.
In Japan, records including detailed shunga show Internal view of anal penetration some males engaged in penetrative anal intercourse with males,  and evidence suggestive of widespread male-female anal intercourse in a pre-modern culture can be found in the erotic vases, or stirrup-spout pots, made by the Moche people of Peru; in a survey, of a collection of these pots, it was found that 31 percent of them depicted male-female anal intercourse significantly more than any other sex act.
Therefore, the reverse of common practices was often portrayed. The Larco Museum houses an erotic gallery in which this pottery is showcased. In many western countries, anal sex has generally Internal view of anal penetration taboo since the Middle Ageswhen heretical movements were sometimes attacked by accusations that their members practiced anal sex among themselves.
The term buggery originated in medieval Europe as an insult used to describe the rumored same-sex sexual practices of the heretics from a sect originating in Bulgariawhere its followers were called bogomils ;  when they spread out of the country, they were called buggres from the ethnonym Bulgars.
He may have intercourse with her whenever he so desires and kiss any organ of her body he wishes, and he may have intercourse with her naturally or unnaturally [traditionally, unnaturally refers to anal and oral sex], provided that he does not expend semen to no purpose. Nevertheless, it is an attribute of piety that a man should not act in this matter with levity and that he should sanctify himself at the time of intercourse.
Christian texts may sometimes euphemistically refer to anal sex as the peccatum contra naturam the sin against nature, after Thomas Aquinas or Sodomitica luxuria sodomitical lusts, in one of Charlemagne 's ordinancesor peccatum illud horribile, inter christianos non nominandum that horrible sin that among Christians is not to be named.
Liwator the sin of Lot Internal view of anal penetration people, which has come to be interpreted as referring generally to same-sex sexual activity, Internal view of anal penetration commonly officially prohibited by Islamic sects; there are parts of the Quran which talk about smiting on Sodom and Gomorrahand this is thought to be a reference to unnatural sex, and so there are hadith and Islamic laws which prohibit it.
The most common formulation of Buddhist ethics is the Five Precepts. These precepts take the form of voluntary, personal undertakings, not divine mandate or instruction.
The third of the Precepts is "To refrain from committing sexual misconduct ". Therefore, the interpretation of what kinds of sexual activity are acceptable for a layman is not a religious matter as far as Buddhism is concerned.
Although Hindu society does not formally acknowledge sexuality between men, it formally acknowledges and gives space to sexuality between men and third genders as a variation of male-female sex meaning a part of heterosexuality, rather than homosexuality, if analyzed in western terms.
Hijras, Alis, Kotis, etc.