One or more of the participants may engage in autoerotic sexual activity, such as masturbation, possibly without physical contact with the other participants. Generally, interest differs between people, and gender depends on sexual orientation. Spanking or whipping pornography involves spanking or whipping, generally of the buttocks, with the hand or with other objects such as belts, switches, paddles, brushes, or whips. The consent and compliance for a sadomasochistic situation can be horny milfs granted only by people who can judge the potential results. Pornographic films are generally classified into sub-genres which describe the sexual fantasy which the film and actors attempt to create. Gonzo porn is influenced by amateur pornography, and it tends to use far fewer full-body/wide shots in favor of more close-ups . Pegging is a sexual practice in which a woman performs anal sex on a man by penetrating the man anus with a strap-on dildo. The stimulation may involve hands, fingers, everyday objects, sex toys or combinations hot gay sex of these. In addition to mainstream pornography, the popularity of facials has led to creation of its own niche market, like video series that specialize in showing the act. The name of the practice, when it is done in a repeated in-and-out motion, is derived from its passing resemblance to the dipping of a tea bag into a cup of hot water as a method of brewing tea. Many men who like trans partners of any variety, known as tranny chasers, do not necessarily identify as gay themselves. Bobbi S. Targets the male audience, but is much less popular than Yaoi. The sub-genres usually conform to certain conventions, and lesbian hentai each may appeal to a particular audience. Pleasure for the giver during anilingus is usually based more on the principle of the act. Group sex is sexual behavior involving more than two participants. Others may also use vibrators and other sexual devices more commonly associated with female masturbation. The first pegging scene appears to have been in the non-pornographic 1970 film Myra Breckinridge, based on the novel of the same name by Gore Vidal, although it was not explicit.