Originating in Japan in the 1980s, the genre subsequently spread to North America horny milfs and Europe, and crossed over into gay pornography. Sadomasochism is practiced in isolation relatively rarely, though some masochists report gay bear porn biting, pinching, or even stun-gunning themselves as a prelude to, or as part of, masturbation. Often, strong views are expressed with regard to anal sex; it is controversial in various cultures, especially with regard to religion, commonly due to prohibitions against anal sex among gay men or teachings about the procreative purpose of sexual activity. As a result, little in history was documented to give an accurate description of how female homosexuality is expressed. Use of the agreed safeword is seen by some as an explicit withdrawal of consent. Examples include the Girls Gone Wild and Girls Who Like Girls Series. Kurt Wild, who appeared as a bottom in Lucas Entertainment Gigolos, is married to a woman and has three children. Rainbow party A rainbow party is an urban legend spread from the early 2000s. This may help them develop their orgasm, increase its pleasure, and may inspire them to masturbate on a more frequent basis. Some may keep their hand stationary while pumping into it with pelvic thrusts in order to simulate the motions of sexual intercourse. In some scenes or relationships it may be impossible for consent to be withdrawn in the middle of a scene, or the bottom may have the ability to revoke consent for a relationship as a whole, but not for a particular scene. Typically featured are hitting, choking, name-calling and hair-pulling. Men may find stimulation of the anus, rectum, and adjacent organs enjoyable. A variant of A2M is ATOM where hentai sex a performer inserts his penis directly from one recipient anus into a second recipient mouth. Transsexual porn star Wendy Williams has stated that transsexual Porn is classified as Straight Specialty. Transgender pornography features performers who cross-dress for sexual gratification, either for themselves or for their partners.