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Home > Human sexual behavior

1.3 Norms and rules

Sexual behavior, like other kinds of social activity, is generally governed by rules which are culturally specific and vary widely (see sexual morality, sexual norms).

Some activities are actually illegal in some jurisdictions even between (or among) consenting people (see sex crime, sodomy law, incest).

Some people engage in various sexual activities as a business transaction; this is called prostitution.

Nearly all cultures consider it a serious crime to force someone to engage in sexual behavior or to engage in sexual behavior with someone who does not consent. This is called sexual assault, and in the case of sexual intercourse it is called rape, the most serious kind of sexual assault. Details on this distinction may vary. Also, precisely what constitutes effective consent to have sex varies from culture to culture and is frequently debated. Laws regulating what constitutes consent, including the minimum age at which a person can consent to have sex, are frequently the subject of debate; see age of consent.

2 Classification

Whilst the best-known sexual behavior is vaginal intercourse, the wide range of human sexual activities includes, but is not limited to:

• anal sex
• BDSM
• foreplay
• frotteurism and tribadism
• fisting
• masturbation
• oral sex ( cunnilingus, fellatio, rimming, felching, tea bagging, snowballing)
• outercourse
• petting
• seduction
• sexual fetishism
• vaginal sex

Generally less common, but still widespread, are the various paraphilias. Some of the more common ones are:

• Bondage
• Foot fetishism
• Leather fetishism
• Rubber fetishism
• Spanking
• Transvestic fetishism

Some forms of sexual activity involve someone else, but not touching the other:

• phone sex
• cybersex
• exhibitionism
• voyeurism

Other special forms of human sexual behaviour:

• Prostitution
• Orgies
• Role-playing

3 Body fluids and birth control

All sexual behaviors that involve the contact of semen with the vagina or vulva may result in pregnancy. To prevent pregnancy, many people employ a variety of birth control measures.

All sexual behaviors that involve contact with another person or the bodily fluids of another person entail some risk of transmission of sexually transmitted diseases, which is why safer sex techniques are recommended. These techniques are generally seen as less necessary for those in committed monogamous relationships with persons who have been demonstrated to be free of disease.

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Sexual selectionThe Descent of Man and Selection in Relation to Sex by Charles Darwin showing the tufted coquette Lophornis ornatus female on left, ornamented male on right. Sexual selection is the theory that competition for mates between individuals of the same sex dri Sexually-transmitted infectionSexually-transmitted diseases STD s) also known as sexually-transmitted infections STI s) are diseases that are commonly transmitted between partners through some form of sexual activity, most commonly vaginal intercourse, oral sex, or anal sex. They were Sexual orientationSexual orientation, sexual preference or sexual inclination describes the focus of a person's amorous or erotic desires, fantasies, and feelings. A person's sexual orientation is most often classified by the gender(s) one is "oriented" towards, as: hetero Sexual abstinenceSexual abstinence or chastity is the practice of voluntarily refraining from sexual intercourse and (usually) other sexual activity. The term chastity more frequently implies the application of force or the existence of rules. Sexual abstinence is typical Sexual minority culturesSexual minority cultures are the heritage of culture, knowledge, and references to which members of sexual minorities fall heir by the fact of their membership in those minorities. Among the first to argue that members of sexual minorities can constitute Sexual dimorphismSexual dimorphism is the systematic difference in form between individuals of different sex in the same species. For example, in some species, including many mammals, the male is larger than the female. In others, such as some spiders, the female is large Sexual Offences Act 2003 Sexual Offences Act