A male voyeur is commonly labeled Peeping Tom, a term which originates from the Lady Godiva legend. Lucky Pierre is slang for a person performing both receptive and insertive lesbian hentai anal and/or vaginal sex simultaneously during a threesome, being positioned between the two partners. The sub-genres usually conform to certain conventions, and each may appeal to a particular audience. Simultaneous penetration of the mouth and either the vagina or anus. Given the wide range of practices, some of which may be engaged in by people who do not consider themselves as practicing BDSM, inclusion in the BDSM community or subculture is usually dependent on self-identification and shared experience. While most tentacle erotica is animated, there are also a few live-action movies. A variant of this is known as ATOM or ATOGM where the insertive partner removes his penis from one recipient anus and inserts it into a second recipient mouth. Some productions are noted for sophisticated and/or experimental storytelling and animation techniques. As with most forms of sexual activity, anal sex participants risk contracting sexually transmitted infections . Gloryhole pornography features women performing fellatio on unidentified men through a small hole made in a bathroom divider. Arousal may be triggered by seeing the body movements or facial expressions of momporn that person. Masturbation has been depicted in art since prehistoric times and is mentioned and discussed in very early writings. Enema pornography involves adults given enemas to others, often fake. Group sex is sexual behavior involving more than two participants. Softcore pornography generally contains nudity or partial nudity in sexually suggestive situations, but without explicit sexual activity, sexual penetration or extreme fetishism, while gay movies hardcore pornography may contain graphic sexual activity and visible penetration, including unsimulated sex scenes. Performers are usually clean-shaven, thinner and more effeminate than ones in mainstream gay pornography.