Human sexual activity in the context of "Syphilis"

Perversion is a form of human behavior which is far from what is considered to be orthodox or normal. Although the term perversion can refer to a variety of forms of deviation, it is most often used to describe sexual behaviors that are considered particularly abnormal, repulsive or obsessive. Perversion usually differs from "deviant behavior", in that the latter covers areas of behavior (such as petty crime) for which perversion would be too strong a term. It is often considered derogatory, and, in psychological literature, the term paraphilia has been used as a replacement for most forms of sexual perversion, though this clinical term is controversial, and deviation is sometimes used in its place.

A brothel, strumpet house, bordello, bawdy house, ranch, house of ill repute, house of ill fame, or whorehouse is a place where people engage in sexual activity with prostitutes. For legal or cultural reasons, establishments often describe themselves as massage parlors, bars, strip clubs, body rub parlours, studios, or by some other description. Sex work in a brothel is considered safer than street prostitution.

Black comedy, also known as black humor, bleak comedy, dark comedy, dark humor, gallows humor or morbid humor, is a style of comedy that makes light of subject matter that is generally considered taboo, particularly subjects that are normally considered serious or painful to discuss, aiming to provoke discomfort, serious thought, and amusement for their audience. Thus, in fiction, for example, the term black comedy can also refer to a genre in which dark humor is a core component.

Black comedy differs from blue comedy—which focuses more on topics such as nudity, sex, and body fluids—and from obscenity. Additionally, whereas the term black comedy is a relatively broad term covering humor relating to many serious subjects, gallows humor tends to be used more specifically in relation to death, or situations that are reminiscent of dying. Black humor can occasionally be related to the grotesque genre. Literary critics have associated black comedy and black humor with authors as early as the ancient Greeks with Aristophanes.

A fertility deity is a god or goddess associated with fertility, sex, pregnancy, childbirth, and crops. In some cases these deities are directly associated with these experiences; in others they are more abstract symbols. Fertility rites may accompany their worship. The following is a list of fertility deities.

Heterosexuality is romantic attraction, sexual attraction, or sexual behavior between people of the opposite sex or gender. As a sexual orientation, heterosexuality is "an enduring pattern of emotional, romantic, and/or sexual attractions" to people of the opposite sex. It "also refers to a person's sense of identity based on those attractions, related behaviors, and membership in a community of others who share those attractions." Someone who is heterosexual is commonly referred to as straight.

Along with bisexuality and homosexuality, heterosexuality is one of the three main categories of sexual orientation within the heterosexual–homosexual continuum. Across cultures, most people are heterosexual, and heterosexual activity is by far the most common type of sexual activity. Heterosexuality has mostly been viewed as the normative and most socially dominant form of sexual orientation.

Anal sex or anal intercourse principally means the insertion and thrusting of the erect penis into a person's anus, or anus and rectum, for sexual pleasure. Other forms of anal sex include anal fingering, the use of sex toys, anilingus, and pegging. Although anal sex most commonly means penile–anal penetration, sources sometimes use anal intercourse to exclusively denote penile–anal penetration, and anal sex to denote any form of anal sexual activity, especially between pairings as opposed to anal masturbation.

While anal sex is commonly associated with male homosexuality, research shows that not all homosexual men engage in anal sex and that it is not uncommon in heterosexual relationships. Types of anal sex can also be part of lesbian sexual practices. People may experience pleasure from anal sex by stimulation of the anal nerve endings, and orgasm may be achieved through anal penetration – by indirect stimulation of the prostate in men, indirect stimulation of the clitoris or an area in the vagina (sometimes called the G-spot) in women, and other sensory nerves (especially the pudendal nerve). People may also find anal sex painful, sometimes extremely so, which may be due to psychological factors in some cases.

Non-penetrative sex or outercourse is sexual activity that usually does not include sexual penetration, but some forms, particularly when termed outercourse, include penetrative aspects, that may result from forms of fingering or oral sex. It generally excludes the penetrative aspects of vaginal, anal, or oral sex, but includes various forms of sexual and non-sexual activity, such as frottage, manual sex, mutual masturbation, kissing, or hugging.

People engage in non-penetrative sex for a variety of reasons, including as a form of foreplay or as a primary or preferred sexual act. Heterosexual couples may engage in non-penetrative sex as an alternative to penile-vaginal penetration, to preserve virginity, or as a type of birth control. Same-sex couples may also engage in non-penetrative sex to preserve virginity, with gay males using it as an alternative to anal penetration.

Celibacy (from Latin caelibatus) is the state of voluntarily being unmarried, sexually abstinent, or both. It is often in association with the role of a religious official or devotee. In its narrow sense, the term celibacy is applied only to those for whom the unmarried state is the result of a sacred vow, act of renunciation, or religious conviction. In a wider sense, it is commonly understood to only mean abstinence from sexual activity.

Celibacy has existed in one form or another throughout history, in virtually all the major religions of the world, and views on it have varied. The Hindu concept of brahmacharya encourages celibacy during adolescence, to allow one to focus on learning, and in later years, as a way of attaining spiritual liberation. Jainism, on the other hand, preached complete celibacy even for young monks and considered celibacy to be an essential behavior to attain moksha. Buddhism is similar to Jainism in this respect. There were, however, significant cultural differences in the various areas where Buddhism spread, which affected the local attitudes toward celibacy. A somewhat similar situation existed in Japan, where the Shinto tradition also opposed celibacy. In most native African and Native American religious traditions, celibacy has been viewed negatively as well, although there were exceptions like periodic celibacy practiced by some Mesoamerican warriors.

Human female sexuality encompasses a broad range of behaviors and processes, including female sexual identity and sexual behavior, the physiological, psychological, social, cultural, political, and spiritual or religious aspects of sexual activity. Various aspects and dimensions of female sexuality, as a part of human sexuality, have also been addressed by principles of ethics, morality, and theology. In almost any historical era and culture, the arts, including literary and visual arts, as well as popular culture, present a substantial portion of a given society's views on human sexuality, which includes both implicit (covert) and explicit (overt) aspects and manifestations of feminine sexuality and behavior.

In most societies and legal jurisdictions, there are legal bounds on what sexual behavior is permitted. Sexuality varies across the cultures and regions of the world, and has continually changed throughout history, and this also applies to female sexuality. Aspects of female sexuality include issues pertaining to body image, self-esteem, personality, sexual orientation, values and attitudes, gender roles, relationships, activity options, and communication.

Sexual abstinence or sexual restraint is the practice of refraining from sexual activity for reasons medical, psychological, legal, social, philosophical, moral, religious or other. It is a part of chastity. Celibacy is sexual abstinence generally motivated by factors such as an individual's personal or religious beliefs. Sexual abstinence before marriage is required by social norms in some societies, or by law in some countries.

Abstinence may be voluntary (when an individual chooses not to engage in sexual activity due to moral, religious, philosophical, or other reasons), an involuntary result of social circumstances (when one cannot find any willing sexual partners), or legally mandated (e.g. in countries where sexual activity outside marriage is illegal, in prisons, etc.).