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. Some do not use the diapers at all, for arousal, or bladder and bowel movements. Entacle erotica describes a type of pornography most commonly found in Japan which integrates traditional pornography with elements of bestiality and a fantasy, horror, or science-fiction theme. A sex party is a gathering at which sexual activity takes place. Men may also rub or massage the glans, the rim of the glans, and the frenular delta. It is typically animated pornography, as the legal age to be featured in a pornographic film in Japan is 18. The range of its individual characteristics is thereby wide. Urolagnia is a form of salirophilia in which sexual excitement is associated with the sight or thought of urine or urination. Examples of heterosexual pornographic film series featuring creampies include Cream Filled Teens and Internal Cumbustion. Softcore gay pornography also exists; it at one time constituted the genre, and may be produced as beefcake pornography for heterosexual female and homosexual male consumption. The name is a reference to gonzo big tit milf journalism, in which the reporter is part of the event taking place. For legal reasons, hentai porn the vast majority of so-called reality porn involves professional actors and actresses posing as so-called amateurs. Transgender pornography features performers who cross-dress for sexual gratification, either for themselves or for their partners. Transsexual porn star Wendy Williams has stated that transsexual Porn is classified as Straight Specialty. Bara male gay twink porn homosexual hentai designed to appeal to men. 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. Examples include the Girls Gone Wild and Girls Who Like Girls Series. Animal masturbation has been observed in many species, both in the wild and in captivity.