Transgender pornography features performers who cross-dress for sexual gratification, either for hentai videos themselves or for their partners. The concept of lesbian, to differentiate women with a shared sexual orientation, is a 20th-century construct. These agreements are binding in the sense that the parties have the expectation that the negotiated rules will be followed. Rainbow parties were covered on The Oprah Winfrey Show in 2003, and became the subject of a juvenile novel called Rainbow Party. The porn industry and viewing public were shocked by the then-taboo spectacle of a white woman having sex with a black man. 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. Women porn is often produced by women and aimed specifically at the female market - rejecting the view that men are turned on by porn but women only by a box of chocolates. There has been an increase in discussion and portrayal of masturbation videos gays in art, popular music, television, films, and literature. It is commonly depicted momsex in pornography, but very rarely in mainstream cinema. Two women tapegagged and cuffed to iron bars Bondage and Discipline are two aspects of BDSM that do not seem to relate to each other because of the type of activities involved, but they have conceptual similarities, and that is why they appear jointly. Related genres include: Amateur pornography originally referred only to pornography produced by amateurs but now also includes professionally made pornography designed to appear as if it were amateur. Diaper pornography involves performers wearing diapers, sometimes with an adult performer acting in the role of a caretaker. The definition clash also appears with the English definition of yuri as any lesbian relationship, as opposed to its sexually explicit definition in Japan. Terminology for roles varies widely within the various BDSM subcultures.