A variant of A2M is ATOM where a performer inserts his penis directly from one recipient anus into a second recipient mouth. 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 hot gay sex featuring live actors, there is exist categories of pornographic manga , pornographic computer games , and pornographic anime . The existence of such content in commercially available pornography gay hentai is widely considered an urban legend. Related genres include: Amateur pornography originally referred only to pornography produced by amateurs but now also includes professionally made pornography designed to appear as if it were amateur. It contains graphic sexual activity and visible penetration. The big tit milf term sadomasochism is derived from the words sadism and masochism . The act may be carried out face to face, or head to tail, with the woman recommended to be on top if she has smaller breasts. Reality pornography is professionally made porn which seeks to emulate the style of amateur pornography. Advocates of RACK argue that SSC can hamper discussion of risk because no activity is truly safe, and that discussion of even low-risk possibilities is necessary for truly informed consent. A homosexual threesome would involve either three men or three women. These scenes may involve the female actor calling for the shot to be directed at some specific part of her body. 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. These agreements are binding in the sense that the parties have the expectation that the negotiated rules will be followed. Foot fetish pornography features heavy emphasis on the feet of the participants, either in combination with kissing and genital sex or in the context of acts such as trampling or crush fetishism.