These scenes may involve the female actor calling for the shot to be directed at some specific part of her body. Originating in Japan in the 1980s, the genre subsequently spread to North America and Europe, and crossed over into gay pornography. As of 2013, little analysis of this paraphilia has been reported in medical literature. Pornography in Japan is large and intertwined business of adult entertainment with unique characteristics that readily distinguish it from western pornography. Group sex is sexual behavior involving more than two participants. Men may find stimulation of the anus, rectum, and adjacent organs enjoyable. The term hentai is never used lesbian hentai in this momsex context in Japanese. Greater economic and social freedom allowed them gradually to be able to determine how they could form relationships and families. Individuals are also sometimes abbreviated when referred to in writing, so a dominant person may be referred to as a Dom for a man, and a Domme for a woman. Internal ejaculations, followed by images of semen dripping from the anus, are sometimes depicted in bareback gay pornography, where they are referred to by the term breeding or the reverse money shot. Since the 1980s, many practitioners and organizations have adopted the motto safe, sane and consensual, commonly abbreviated as SSC, which means that everything is based on safe activities, that all participants be of sufficiently sound/sane mind to consent, and that all participants do consent. In more vigorous forms of fisting, such as punching or punchfisting, a fully clenched fist may be inserted and withdrawn slowly. A somewhat controversial ejaculation control technique is to put pressure on the perineum, about halfway between the scrotum and the anus, just before ejaculating. Incest itself is largely taboo, and is a crime in many countries. The term lesbian is also used with regard to sexual identity or sexual behavior, regardless of sexual orientation, or as an adjective gay twinks to characterize or associate nouns with female homosexuality or same-sex attraction.
