Adult animation is genre of animation geared towards adults and sometimes teens. Generally, interest differs between people, and gender depends on sexual orientation. Transgender pornography features performers who cross-dress for sexual gratification, either for themselves or for their partners. The original definition of dogging – and which is still a closely related activity – is spying on couples having sex in a car or other public place. In general, BDSM play is usually structured such that it is possible for the consenting partner to withdraw his or her consent during a scene; for example, by using a safeword that was agreed on in advance. Its primary goal is sexual arousal in its audience. Pornography is often referred to as porn and a pornographic work as a porno. As of 2013, lesbian hentai little analysis of this paraphilia has been reported naked milf in medical literature. First found in softcore movies and erotic thrillers, depictions of lesbianism entered mainstream cinema in the 1980s. Films with risqué content commenced to be produced soon after the invention of the motion picture in the 1880s. Watersports pornography features sexual activities involving urine, such as golden showers. It is commonly depicted in pornography, but very rarely in mainstream cinema. The term combines elements of the Freudian psychoanalytic fetish and the Marxist commodity fetish, and is used in the context of British, Spanish and French colonialism and imperialism and their aftereffects. A pearl necklace gaysex is a slang term referring to a sexual act in which a man ejaculates semen on or near the neck, chest, or breast of another person. Pegging is a sexual practice in which a woman performs anal sex on a man by penetrating the man anus with a strap-on dildo. The term soft crush refers to the more common fetish surrounding videos involving inanimate objects or small invertebrates being crushed, while the term hard crush refers to such videos involving larger animals with vertabrae, and arguably more pain-susceptible animals .