A female dominant in a master/slave relationship is often termed a Mistress, not to be confused with the colloquial usage of mistress as a kept sexual partner gay hentai without a similarly formalized power relationship. Originating in Japan in the 1980s, the genre subsequently spread to North America and Europe, and crossed over into gay pornography. 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. Celebrity sex tapes gay twinks are amateur or professionally-made recordings of sex acts, as performed by a celebrity and their partner. Actual upskirt or downblouse shots may violate privacy laws in some countries. Saliva pornography involves salivation and saliva. It is commonly depicted in pornography, but very rarely in mainstream cinema. The rise of the Internet in the late 1990s and early 2000s similarly changed nude milfs the way pornography film was distributed and furthermore complicated the censorship regimes around the world and the legal prosecution of obscenity. 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. Animal masturbation has been observed in many species, both in the wild and in captivity. Lucky Pierre is slang for a person performing both receptive and insertive anal and/or vaginal sex simultaneously during a threesome, being positioned between the two partners. The term lesbian is also used with regard to sexual identity or sexual behavior, regardless of sexual orientation, or as an adjective to characterize or associate nouns with female homosexuality or same-sex attraction. 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. The term is a slang word that originated in the gay community and comes from the equestrian term bareback, which refers to the practice of riding a horse without a saddle.