Unlike the traditional definition of the term, in fetish usage a cuckold is complicit in their partner sexual infidelity and takes masochistic sexual pleasure in it. However the genre remains a very small proportion of the pornographic DVD market; for example at porn retailer HotMovies. Unlike erotic films, pornographic films contain explicit sexuality and do not claim any artistic merit. One-sided male nudity can also arise when a male disrobes as part of a male striptease. These typically are leaked to the public via the Internet, with or without the celebrity consent. In straight pornography, intercourse is often followed by a facial, pearl hot gay sex necklace or other visible ejaculation. Male masturbation may differ between males who have been circumcised and those who have not. This category also includes pornographic home movies. Twink pornography features younger performers, and usually features young men under 30 who identify as gay or bisexual. Pornography can be classified according to the physical characteristics of the participants, fetish, sexual orientation, etc., as well as the types of sexual activity featured. Said that the female buttocks evolved in the context of females competing for the attention and parental commitment of powerful resource-controlling males as an honest display of fat reserves that could not be confused with another type of tissue, although T. It may also involve touching, rubbing, or pinching the nipples or other erogenous hentai porn zones while masturbating. Through the 1990s, mainstream movie and television actors have been more willing to portray homosexuality, as the threat of any backlash against their careers has lessened and society acceptance of gay and lesbian people has increased. The nipples are erogenous zones, and vigorous stimulation of them during masturbation usually causes the penis to become erect more quickly than it would otherwise. The term has as its origins Frantz Fanon epidermal schema momsex and Edward Said Orientalism. Since at least 1973, it has also been used to refer to a sexually attractive young woman.