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...

human genitals, and may be vibrating or non-vibrating. The term sex toy can also include BDSM apparatus and sex furniture such as sex swings; however...

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...

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

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...

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

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...

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...

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...

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

many species deviate from an even sex ratio, either periodically or permanently. Examples include parthenogenic and androgenetic species, periodically...

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...

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...

sensuality and romantic love. Sex in film can be distinguished from a sex film, which usually refers to a pornographic sex film and sometimes to a sex education...

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

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

that her book , Sex , sold 80 , 000 in the first half an hour in London. "Fear factor: Conspiracy theories go mainstream". The Globe and Mail. November...

Sex): Sex is risky and costly. Why then do human beings, unlike most animals, have recreational sex just for fun? Diamond says there are two theories...

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

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...

organisms that create their offspring using sexual reproduction have two common sexes and a few less common intersex variations. In some species, there are...

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

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...

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

Extramarital sex is any act of copulation outside of marriage. Accordingly, these constitute sexual acts between two persons who are not married with...

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

The sex-positive movement is a social and philosophical movement that seeks to change cultural attitudes and norms around sexuality, promoting the recognition...