Some techniques which may work for one individual can be difficult or uncomfortable for another. Bisexual pornography is a genre of pornography which most typically depicts one woman and two men who all perform sex acts on each other. The term hentai is never used in this context in Japanese. Japanese rope bondage is distinguished by its use of specific katas and aesthetic rules. Unlike the traditional definition of the term, in fetish usage a cuckold is complicit in their partner sexual infidelity and takes masochistic sexual pleasure in it. Boot fetishism gaysex is a sexual fetish dedicated to boots. This is why video stores might consider stocking transgendered subject matter in the straight section, as some straight men will have passive or active sex with another man as long as their partner appears to look like a woman to them, to some minor or major degree. Such films continued to be produced but could only be distributed anime hentai by underground channels. Facial cum shots are currently regularly portrayed in pornographic films and videos, often as a way to close a scene. High heel pornography involves women or men dressed in high heeled shoes. Bareback sex is physical sexual activity, especially sexual penetration, without the use of a condom. Some BDSM practitioners prefer a code of behavior that differs from SSC and is described as risk aware consensual kink , indicating a preference for a style in which the individual responsibility of the involved parties is emphasized more strongly, with each participant being responsible for his or her own well-being. First found in softcore movies naked milf and erotic thrillers, depictions of lesbianism entered mainstream cinema in the 1980s. Voyeurism: Seeing another urinate without the person knowledge either through video taping by a hidden camera, or by lurking in locations where people are urinating or are likely to have an urge to urinate. The anus has a relatively high concentration of nerve endings and can be an erogenous zone, and the receiver may receive pleasure from external anal stimulation.