A study of the condom usage habits of New Zealand sex workers said that they offered various safe sex alternatives to vaginal sex to clients who refused to wear a condom. Use of the agreed safeword is seen by some as an explicit withdrawal momsex of consent. A scene where many women have sex with one man is referred to as a reverse gang-bang. Foot fetishism has been defined as a pronounced sexual interest in the feet or footwear. Preggo pornography features pregnant performers and may include erotic lactation as a fetish. Following the introduction of the Motion Picture Association of America film rating system, independent animation producers attempted to establish an alternative to mainstream animation. On the other hand, the masochist enjoys being hurt, humiliated, or suffering within the consensual scenario. Clothed male, naked female is one-sided female nudity in which one or more females are nude while one or more men are clothed. The warm sensation felt when urine trickles on the body seems to give very relaxing and pleasurable feelings to the person. These are often fake. New York photographer Irving Klaw also published illustrated adventure/bondage serials by fetish artists videos gays Eric Stanton, Gene Bilbrew, Adolfo Ruiz and others. Sadomasochism refers to the aspects of BDSM surrounding the exchange of physical or emotional pain. Erotic spankings are commonly combined hentai sex with other forms of sexual foreplay. His most famous model was Bettie Page, who became the first celebrity of bondage film and photography. Such ejaculation can be done by mammary intercourse, or masturbation over the other person, or result from the withdrawal of the penis from a partner mouth as he is ejaculating following fellatio, irrumatio, or intercourse. Patricia Hill Collins, an African-American writer, theorizes that this is derived from a stereotype that those of black descent are promiscuous, and their buttocks are objectified by porn as a result. The name was coined from the title of the controversial book.