Enema pornography involves adults given enemas to others, often fake. POV pornography involves camera angles designed to provide the viewer a view similar to that seen by one of the participants, whose face is never shown. Pornographic films are generally classified into sub-genres hentai videos which describe the sexual fantasy which the film and actors attempt to create. Big Beautiful Woman is a euphemism for an overweight woman and is frequently used in the context of fat fetishism. Others involve partners who naturally have a significant difference in size. In the United States, creating, distributing, or possessing crush videos has been illegal since 1999, and many other countries also have banned them. In places where non-monogamous sex is taboo or illegal, group sex may take place in private or clandestine locations including homes, hotel rooms, or private clubs. Fisting, handballing, fist-fucking, brachiovaginal, or brachioproctic momporn insertion is a sexual activity that involves inserting a hand into the vagina or rectum. Bodily functions Menstrual or red rhapsody pornography features sexual activities involving women who are menstruating, with a focus on the menstrual blood. The stimulation may involve hands, fingers, everyday objects, sex toys or combinations of these. Erotic spanking is the act of spanking another person for the sexual arousal or gratification of either or both parties. Some couples use a threesome as a way to develop a love triangle . Instead, lesbian relationships videos gays have often been regarded as harmless and incomparable to heterosexual ones unless the participants attempted to assert privileges traditionally enjoyed by men. Weather Report Girl is considered yuri hentai in English usage for its depiction of lesbian sex, but in Japan it is just yuri. The meaning of hentai is perversion, abnormality, or metamorphosis. Teacher and Student or Boss and Secretary pornography involves sexualized situations which take place between an authority figure, such as a teacher or boss, and an underling, such as a student or secretary, often fake.