Pornography is often distinguished from erotica, which consists of the portrayal of sexuality with high-art aspirations, focusing also on feelings and emotions, while pornography involves the depiction of acts in a sensational manner, with the entire focus on the physical act, so as to arouse quick intense reactions. Multiple men and women Bisexual pornography features one woman and two men who all perform sex acts on each other. The most common type of erotic spanking is administered on the bare buttocks, but can also be combined with bondage, in order to heighten sexual arousal and feelings of helplessness. Several hundred exclusively pegging films were produced, as well as twice as many bisexual and straight films with strap-on scenes. Pornography may be presented in a variety of media, including books, magazines, postcards, photographs, sculpture, drawing, painting, animation, sound recording, film, video, and video games. John Stagliano is considered to have started the gonzo pornography genre with his Buttman series of films. 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. Sometimes one lesbian hentai or more fingers may be inserted into the vagina to stroke its frontal wall where the G-spot may be located. This industry employs thousands of performers along with support and production staff. Ass lesbian milfs to mouth pornography shows the transfer of a performer penis from a second performer anus to that same second performer mouth in a single shot. The prostate gland is one of the organs that contributes fluid to semen. Entacle erotica describes a type of pornography most commonly found in Japan which integrates traditional pornography with elements of bestiality and a fantasy, horror, or science-fiction theme. As of 2013, little analysis of this paraphilia has been reported in medical literature. Incest itself is largely taboo, and is a crime in many countries. Reality pornography is professionally made porn which seeks to emulate the style of videos porno gay amateur pornography.