The phrase is commonly found on porn sites. The definition clash also appears with the English definition of yuri as any lesbian relationship, as opposed to its sexually explicit definition in Japan. There may be more than two participants; both group sex and gang banging can be included. The wife who enjoys cuckolding her husband is frequently called a hotwife, or a cuckoldress momporn if the man is more submissive. Originating in Japan in the 1980s, the genre subsequently spread to North America and Europe, and crossed over into gay pornography. This fetish sometimes originates from childhood memories of needing, or of seeing another needing, to urinate. Bisexual pornography is a genre of pornography gay twinks which most typically depicts one woman and two men who all perform sex acts on each other. However, bisexual pornography is often placed near the gay section in adult video stores, since many consumers are gay men. 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. Ass 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. Tentacle rape or shokushu goukan is found in some horror or hentai titles, with tentacled creatures having sexual intercourse with female hentai sex characters. Shibari is a Japanese word that literally means to tie or to bind. 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. The original definition of dogging – and which is still a closely related activity – is spying on couples having sex in a car or other public place. English adopts and uses hentai as a genre of pornography by the commercial sale and marketing of explicit works under this label. In academic discourse, racial fetishism is a postcolonialist term found in the writings of authors such as Homi K.