The one-sex and two-sex theories are two models of human anatomy or fetal development discussed in Thomas Laqueur's book Making Sex: Body and Gender from...

Sex allocation is the allocation of resources to male versus female reproduction in sexual species.[page needed] Sex allocation theory tries to explain...

male usually carries an X and a Y chromosome (XY), and the female usually carries two X chromosomes (XX). Other chromosomal sex-determination systems in...

versus those the fleas produce asexually. One of the most widely discussed theories to explain the persistence of sex is that it is maintained to assist sexual...

theories of sex segregation. Difference feminism often justifies sex segregation through women's and men's differences while equal treatment theory does...

While in ordinary speech, the terms sex and gender are often used interchangeably, in contemporary academic literature, the terms often have distinct...

include two of the eight Bedside-films and the six Zodiac-films from the 1970s, all of which were produced in Denmark and had many pornographic sex scenes...

A sex doll (also, joy toy, love doll, fuck doll or blowup doll) is an anthropomorphic sex toy in the size and shape of a sexual partner. The sex doll may...

Sex selection is the attempt to control the sex of the offspring to achieve a desired sex. It can be accomplished in several ways, both pre- and post-implantation...

The sex industry (also called the sex trade) consists of businesses that either directly or indirectly provide sex-related products and services or adult...

activities of direct physical contact between buyers and sellers as well as indirect sexual stimulation". Sex work only refers to voluntary sexual transactions;...

medical ones, such as Viagra (sildenafil) and Cialis (tadalafil) to increase erectile response and Paxil (paroxetine) to treat premature ejaculation. Sex therapists...

Cunnilingus is oral sex performed on the vulva while fellatio is oral sex performed on the penis. Anilingus, another form of oral sex, is oral stimulation...

two common sexes and a few less common intersex variations. In some species, there are hermaphrodites. There are also some species in which only one sex...

journal Les Temps modernes. One of Beauvoir's best-known and controversial books (banned by the Vatican), The Second Sex is regarded as a groundbreaking...

Sex and the City is an American romantic comedy-drama television series created by Darren Star for HBO. An adaptation of Candace Bushnell's newspaper...

Disorders of sex development (DSDs), also known as differences in sex development or variations in sex characteristics (VSC), are congenital conditions...

wasps, bees, ants, and termites. The human sex ratio is of particular interest to anthropologists and demographers. In human societies, sex ratios at birth...

Sex differences in psychology are differences in the mental functions and behaviors of the sexes and are due to a complex interplay of biological, developmental...

Sex and Culture is a 1934 book by English social anthropologist J. D. Unwin concerning the correlation between a society's level of "cultural achievement"...

third wave (which began in the early 1990s). The two sides became labelled anti-pornography feminists and sex-positive feminists. In 1976, Andrea Dworkin organized...

In game theory, the battle of the sexes is a two-player coordination game that also involves elements of conflict. The game was introduced in 1957 by R...

sexual exploitation of adults or minors, including child sex tourism (CST) and domestic minor sex trafficking (DMST). In 2012, the International Labour Organization...

Sex is a 1992 coffee table book written by American singer Madonna, with photography by Steven Meisel Studio and Fabien Baron. It was edited by Glenn O'Brien...

by the secondary characteristic in one sex and the desire for that characteristic in the other sex. Male birds and fish of many species have brighter...

A sex strike (sex boycott), or more formally known as Lysistratic nonaction, is a method of nonviolent resistance in which one or more persons refrain...

The decriminalization of sex work is the removal of criminal penalties for sex work (specifically, prostitution). Sex work, the consensual provision of...

had one-night extramarital sex and 22% had an affair. According to a 2004 United States survey, 16% of married partners have had extramarital sex, nearly...

cross-sex friendship is a platonic relationship between two unrelated people of differing sexes or gender. There are multiple types of cross-sex friendships...

sexual selection. Sex differences in medicine include sex-specific diseases, which are diseases that occur only in people of one sex; and sex-related diseases...