The arousal from being desperate comes from the sensation of having a full bladder. This type of pornography is almost exclusively hentai, as true hermaphroditic humans are not fertile and are not usually found in nature. While anal sex is commonly associated with male homosexuality, research shows that not all gay males engage in anal sex and that it is not uncommon in heterosexual relationships. Fisher said that perhaps, the fleshy, rounded buttocks attracted males during rear-entry intercourse. Diaper pornography involves performers wearing diapers, sometimes with an adult performer acting in the role of a caretaker. Both sexes sometimes apply milf xxx lubricating substances to intensify sensation. Transsexual porn star Wendy Williams has stated that transsexual Porn is classified as Straight Specialty. Films with risqué content commenced to be produced soon after the invention of the motion picture in the 1880s. Hardcore pornography is pornography that depicts penetration or extreme fetish acts, or both. The term combines elements of the Freudian psychoanalytic fetish and the Marxist commodity fetish, and is used in the context of British, Spanish and French colonialism and imperialism and their gay movies aftereffects. Many cultures describe pain as an aphrodisiac. Throughout history, women have not had the same freedom or independence to pursue homosexual relationships as men, but neither have they met the same harsh punishment as homosexual men in some societies. Because the viewing of such films hentai sex carried a social stigma, they were viewed at brothels, adult movie theaters, stag parties, at home, in private clubs and also at night cinemas. What seems clear from the historical record is that much of the lesbian material in pornographic texts was intended for a male readership. Lolita pornography features women who are 18 years old or slightly older, who pretend to be underage teen girls. Irrespective of the legal or social view of pornography, it has been used in a number of contexts.