First found in softcore movies and erotic thrillers, depictions of lesbianism videos porno gay entered mainstream cinema in the 1980s. A facial is a form of non-penetrative sex, though it is generally hentai porn performed after some other means of sexual stimulation, such as vaginal sex, anal sex, oral sex or masturbation. POV pornography involves camera angles designed to provide the viewer a view similar to that seen by one of the participants, whose face is never shown. Bukkake pornography usually depicts numerous men having sex with one woman, with multiple, usually 10 or more, men ejaculating on the female face. Well-known female porn stars who expressed their pleasure in pegging their male partners include Taylor Wane, Debi Diamond, Brittany Andrews, and Monique Covét. Human urinal: An act common in the bondage sex community where a male or female slave will serve as a urinal for a dominant partner. Consent is the most important criterion here. In pornography, depictions of lesbian sex form a popular subgenre, directed toward a male heterosexual and female homosexual audience. Targets the male audience, but is much less popular than Yaoi. Though the term anal sex most commonly means penile-anal penetration, sources sometimes use the term anal intercourse to refer exclusively to penile-anal penetration, and anal sex to refer to any form of anal sexual activity, especially between pairings as opposed to anal masturbation. Some couples use a threesome as a way to develop a love triangle . Sloppy seconds is a slang phrase for when a man has sexual intercourse with another person who already has received another man penis in the relevant orifice and is therefore wet or sloppy. See Gay-for-pay. Individuals who can change between top/dominant and bottom/submissive roles—whether from relationship to relationship or within a given relationship—are known as switches, though the term switch in this context is occasionally seen as derogatory and is rejected by lesbian milfs many who might simplistically fit the definition.