Pornographic films are typically categorized as either softcore or hardcore pornography. BDSM communities generally welcome anyone with a non-normative streak who identifies with the community; this may include cross-dressers, extreme body mod enthusiasts, animal players, latex or rubber aficionados, and others. Transgender pornography gay fuck features performers who cross-dress for sexual gratification, either for themselves or for their partners. New York photographer Irving Klaw also published illustrated adventure/bondage serials by fetish artists Eric Stanton, Gene Bilbrew, Adolfo Ruiz and others. However, bisexual pornography is often placed near the gay section in adult video stores, since many consumers are gay men. The reverse of this, in which nude women interact with clothed men, is called Clothed male, naked female . Patricia Hill Collins, an African-American writer, theorizes that this is derived from a stereotype that those of black descent are promiscuous, and their buttocks are objectified by porn as a result. The term BDSM dates back to 1969; however, the origin of the term BDSM is unclear and is believed to have been formed either from joining the term B&D with S&M , or as a compound initialism from B&D, D&S , and S&M. The first explicit pegging scene is believed to have been in the 1975 pornographic film The Opening of Misty Beethoven. This type of pornography is almost exclusively hentai, as true hermaphroditic humans are not fertile and are not usually found in nature. Group sex pornography features at least two men and two women , usually more, who all perform sex acts hentai movies on each other. Starting with erotic stories and woodblock prints from before the 20th century, Japanese pornography evolved into distinct subcategories with the media that in addition of pornographic videos and magazines featuring live actors, there is exist categories of pornographic manga , pornographic computer games , and pornographic anime . 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 milf xxx to arouse quick intense reactions.