Perhaps following the example set by gay pornography, they have become a popular subgenre within heterosexual pornography since the turn of the century, featuring both vaginal and anal ejaculations. Kurt Wild, who appeared as a bottom in Lucas gay sex video Entertainment Gigolos, is married to a woman and has three children. Some pornographic films use an artificial semen substitute to simulate or enhance creampie shots. 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. Many transgender people regard the term shemale as offensive, arguing that it mocks or shows a lack of respect towards the gender identity and gender expression of transgender individuals; in this view, the term emphasizes the biological sex of a person and neglects their gender. Clothed male, naked female is one-sided female nudity in which one or more females are nude while one or more men are clothed. Snowballing or snowdropping is the human sexual practice in which one person takes someone else semen into his or her mouth and then passes it to the mouth of the other, usually through kissing. Foot fetishism has been defined as a pronounced sexual interest in the feet or footwear. Those with diaper-related paraphilias differ widely in their focus of attention. In some creampie films, both gay and straight, intercourse and internal ejaculation are followed by performers licking up the semen that has dripped from their bodies. Breast fetishism is a paraphilic sexual interest focused on female breasts . Coprophilia , also called scatophilia or scat , is the paraphilia involving sexual arousal and pleasure milf fuck from feces. Both sexes sometimes apply lubricating substances to intensify sensation. This is commonly called double vaginal penetration anime hentai or double stuffing. Real school shots or videos which are sexualized may violate privacy laws in some countries. For a foot fetishist, points of attraction include the shape and size of the foot and toes , jewelry , treatments , state of dress , odor, and sensory interaction .