One study found that about 12% of gay men find it too painful to pursue receptive anal sex, and concluded that the perception of anal sex as painful is just as likely to be psychologically or emotionally based as it is to be physically based. The Latin term genitalia, sometimes anglicized as genital area, is used to describe the externally visible sex organs, known as primary genitalia or external genitalia: in males, the penis and scrotum; and in females, the clitoris and vulva.The other, hidden sex organs are referred to as the secondary genitalia or internal genitalia. The most important of these are the gonads, a pair of sex organs, specifically the testes in the male or the ovaries in the female. The visible portion of the mammalian genitals for males consists of scrotum and a penis; for females, it consists of the labia, clitoris and vagina.In humans, women have two genital orifices, the vagina and urethra, while men have only one, the urethra. Male and female genitals have many nerve endings, resulting in pleasurable and highly sensitive touch.In most human societies, particularly in conservative ones, genitals are considered a public indecency and sometimes even illegal if left uncovered in public.[The anal sphincters are usually tighter than the pelvic muscles of the vagina, which can enhance the sexual pleasure for the inserting male during male-to-female anal intercourse because of the pressure applied to the penis.Men may additionally enjoy the penetrative role during anal sex because of its association with dominance, because it is made more alluring by a female or general society insisting that it is forbidden, or primarily because it presents an additional option for penetration.heterosexual anal sex, female participants stated that direct stimulation of multiple erogenous zones simultaneously (the clitoris, the G-spot, the anus, or other erogenous zones) enabled them to enjoy anal intercourse with much less discomfort compared to anal penetration by itself and to orgasm from it. Women who experienced orgasm during anal sex accompanied by direct stimulation of one or more of the other erogenous zones described it as more of a full-body experience compared to orgasm from direct clitoral stimulation alone.Pain during receptive anal sex is formally known as anodyspareunia. Factors predictive of pain during anal sex include inadequate lubrication, feeling tense or anxious, lack of stimulation, as well as lack of social ease with being gay and being closeted. 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.Women may sexually stimulate a man's anus by fingering the exterior or interior areas of the anus; they may also stimulate the perineum (which, for males, is between the base of the scrotum and the anus), massage the prostate or engage in anilingus.Sex toys, such as a dildo, may also be used. The practice of a woman penetrating a man's anus with a strap-on dildo for sexual activity is called pegging. With regard to lesbian sexual practices, anal sex includes fingering, use of a dildo or other sex toys, or anilingus. Some lesbians do not like anal sex,and anilingus is less often practiced among female same-sex couples.Oral sex alone cannot result in pregnancy and heterosexual couples may perform oral sex as their method of contraception. For conception to take place, sperm from the penis must enter the uterus and fallopian tubes and fertilize the female's egg. In humans, there is no connection between the gastrointestinal system and the reproductive system,and sperm ingested by the woman would be killed and broken down by acids in her stomach and proteins in the small intestine. The breakdown products are then absorbed as a negligible quantity of nutrients. However, there is a potential risk of pregnancy if semen comes in contact with the vaginal area in some way, such as semen in the ejaculate finding its way onto fingers, hands, or other body parts, which then comes in contact with the vaginal area. Oral sex is commonly used as a means of preserving virginity, especially among heterosexual pairings; this is sometimes termed technical virginity (which additionally includes anal sex, mutual masturbation and other non-penetrative sex acts, but excludes penile-vaginal sex).The concept of "technical virginity" or sexual abstinence through oral sex is popular among teenagers. Additionally, gay males may regard oral sex as a way of maintaining their virginities, with penile-anal penetration defined as resulting in virginity loss, while other gay males may define oral sex as their main form of sexual activity.
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