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 term sadomasochism is derived from the words sadism and masochism . Its primary goal is sexual arousal in its audience. In general, BDSM play is usually structured such that it is possible for the consenting partner to withdraw his or her consent during a scene; for example, by using a safeword that was agreed on in advance. Femdom features BDSM scenes in which the dominant partner is female. Hermaphrodite, also known as herm, refers to pornography, typically hentai, that features persons with the genitalia of both sexes. On May 27, 2010 the television program The Doctors discussed the topic with dozens of teens, parents, and professionals. Pornography milf fuck is often distinguished from erotica, which consists of the portrayal of sexuality with high-art aspirations, focusing also on feelings and emotions, while pornography involves the depiction of acts in a sensational manner, with the entire focus on the physical act, so as to arouse quick intense reactions. If dramatic skills are not involved, a performer in a porn film may also be called a model. Men may also rub or massage the glans, the rim of the glans, and the frenular delta. Older names gay movies for a pornographic film include stag film, and blue movie. These actors often play the top roles but this is not always the case, such as with Kristen Bjorn hentai porn and some Bel Ami models. Works in this genre may be considered adult for any number of reasons. Though there have been numerous gang bang pornographic films since the 1980s, they usually involved no more than half a dozen to a dozen men. Behind the Green Door was one of the first pornographic films to feature sex between a white actress with a black actor . Solo pornography recognized with AVN Awards include the All Alone series and All Natural: Glamour Solos. Diaper fetishism, nappy fetishism or diaperism, is a sexual fetish in which a person feels a desire to wear or use diapers.