Dwarfs or midget pornography features performers who are dwarfs/midgets. Multiple men and women Bisexual pornography features one woman and two men who all perform sex acts on each other. It is commonly depicted in pornography, but very rarely in mainstream cinema. Some techniques which may work for one individual can be difficult or uncomfortable for another. For much of the history of cinema gayporn and television, lesbianism was considered taboo, though since the 1960s it has increasingly become a genre in its own right. The phrase is commonly found on porn sites. Even though the performers who perform in these films typically appear on many reality websites within a short span of time, most of these websites claim that each of them is an amateur. Although pornography has usually focused on heterosexuality, due to the prevalence of the heterosexual orientation, explicit gay material has a long history as well, which reaches back to Greek antiquity, if not to prehistory. Such explicit sexual interaction is seen only rarely in public play spaces, and it is sometimes specifically banned by the rules of a party or playspace. It spawned numerous sequels, several of which won adult film awards. A survey by the New York City Department of Health and Mental Hygiene found that heterosexual women are more likely to bareback when engaging in anal sex than homosexual and bisexual men. Simultaneous penetration of the mouth and either the vagina or anus. Bisexual DVDs sell much better online than in adult video stores, possibly due to customers in stores feeling embarrassed to buy them. For legal reasons, the vast majority of so-called reality porn involves professional actors and actresses posing as so-called amateurs. 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. Hardcore pornography is pornography that depicts penetration or extreme fetish acts, or both.