Each participant gay cock may engage hentai videos in any type of sex acts with one or both of the others, such as vaginal, anal or oral sex or mutual masturbation. Some BDSM practitioners prefer a code of behavior that differs from SSC and is described as risk aware consensual kink , indicating a preference for a style in which the individual responsibility of the involved parties is emphasized more strongly, with each participant being responsible for his or her own well-being. Both forms of pornography generally contains nudity. Other possibilities are possible, such as a man having sex with two women who are having sex with each other. Bottom and submissive are widely recognized terms for those partner in the relationship or activity who are, respectively, the physically receptive or controlled participants. BDSM is a variety of erotic practices involving dominance and submission, role-playing, restraint, and other interpersonal dynamics. A female dominant in a master/slave relationship is often termed a Mistress, not to be confused with the colloquial usage of mistress as a kept sexual partner without a similarly formalized power relationship. Originating in Japan in the 1980s, the genre subsequently spread to North America and Europe, and porn milf crossed over into gay pornography. 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 crush fetish is a fetish in which one is sexually aroused usually when someone crushes objects, food, and sometimes small animals with their body, usually under their foot, or when crushed oneself. Transsexual pornography is a genre of pornography. Clothes wetting: The person is sexually aroused by wetting one clothing or observing another person doing so. A variation on this is to place the fingers and thumb on the penis as if playing a flute, and then shuttle them back and forth. Although pornography has usually focused on heterosexuality, due to the prevalence of the heterosexual orientation, explicit gay material has a long history as well, which reaches back to Greek antiquity, if not to prehistory.