John Stagliano is considered to have started the gonzo pornography genre with his Buttman series of films. Bisexual pornography is a genre of pornography which most typically depicts one woman and two men who all perform sex acts on each other. Foot fetish pornography features heavy emphasis on the feet of the participants, either in combination with kissing and genital sex or in the context of acts such as trampling or crush fetishism. Because the viewing of such films carried a social stigma, they were viewed at brothels, adult movie theaters, stag parties, lesbian hentai at home, in private clubs and also at night cinemas. The wife who enjoys cuckolding her husband is frequently called a hotwife, or a cuckoldress if the man is more submissive. What seems clear from the historical record is that much of the lesbian material in pornographic texts was intended for a male readership. Use of the agreed safeword is seen by some as an explicit withdrawal of consent. These agreements are binding in the sense that the parties have the expectation that the negotiated rules will be followed. Sexual orientation Pornography features an increasing gay movies variety of combinations of actors by their sexual orientation such as lesbian, gay, bisexual, and transsexuals in addition to traditional heterosexual roles. Sigmund Freud considered foot binding as a form of fetishism. Although interracial pornography theoretically can apply to depictions of sexual activity between performers of any different racial groups, the term is most commonly used for heterosexual sex acts between black and white performers. Rape pornography features performers milf fuck simulating rape. There is no singular or archetypical behavior; therefore, a wide range of thought patterns and behaviors exist, but all tends to be a harmless and efficacious release from some kind of pressure. Diaper pornography involves performers wearing diapers, sometimes with an adult performer acting in the role of a caretaker. A pornographic work is characterized as hardcore if it has any hardcore content, no matter how small.