Clothed male, naked female is one-sided female nudity in which one or more females are nude while one or more men are clothed. Behind the Green Door was one of the first pornographic films to feature sex between a white actress with a black actor milf xxx . Some anthropologists and sociobiologists believe that breast fetishism derives from the breasts similarity to buttocks, but instead provide sexual attraction from the front of the body. Irrespective of the legal or social view of pornography, it has been used in a number of contexts. The act may be carried out face to face, or head to tail, with the woman recommended to be on top if she has smaller breasts. Following the introduction of the Motion Picture Association of America film rating system, independent animation producers attempted to establish an alternative to mainstream animation. The term pearl necklace is used by some because the drops of semen deposited by the man resemble a necklace of translucent white pearls. The term BDSM dates back to 1969; however, the origin of the term BDSM is unclear and is believed to have been formed either from joining the term B&D with lesbian hentai S&M , or as a compound initialism from B&D, D&S , and S&M. The loose and direct camera work often includes tight shots of the genitalia, unlike some traditional porn. Likewise, Fox Broadcasting Company has also dedicated an entire evening programming block to adult animation programs, known as Animation Domination. This makes varying degrees of stimulation an integral part of oral sex for many men. The niche popularity grew significantly in the latter half of the first decade of the 2000s. Clothed female, naked male pornography features naked men and clothed women; typically, the women humiliate and abuse the men or perform fellatio and/or handjobs on the men. Women with women Main article: Lesbianism in erotica: Lesbianism in contemporary pornography Lesbian or girl-girl pornography features women engaged in sex together, but is typically aimed at gay fuck a male audience.