In modern BDSM vernacular, the queening stool allows open access to the crotch while seated. It is used, for example, at fertility clinics to stimulate sperm donors. A survey by the New York City Department of Health and Mental Hygiene found that heterosexual women are more likely to bareback when engaging in anal sex than homosexual and bisexual men. The object or situation of interest is called the fetish; the person who has a fetish for that object/situation is a fetishist. Pornography is often referred naked milf to as porn and a pornographic work as a porno. Reality pornography is professionally gay movies made porn which seeks to emulate the style of amateur pornography. Real medical shots or videos may violate privacy laws in some countries. English adopts and uses hentai as a genre of pornography by the commercial sale and marketing of explicit works under this label. There may be more than two participants; both group sex and gang banging can be included. The reverse of this, in which nude women interact with clothed men, is called Clothed male, naked female . Diaper pornography involves performers wearing diapers, sometimes with an adult performer acting in the role of a caretaker. The term applies to the depiction of the act rather than the act itself, and so does not include live exhibitions like sex shows and striptease. Although interracial pornography theoretically can apply to depictions of sexual activity between performers of any different gay hentai racial groups, the term is most commonly used for heterosexual sex acts between black and white performers. Examples include the Girls Gone Wild and Girls Who Like Girls Series. Performers are usually clean-shaven, thinner and more effeminate than ones in mainstream gay pornography. As of 2013, little analysis of this paraphilia has been reported in medical literature. Voyeurism: Seeing another urinate without the person knowledge either through video taping by a hidden camera, or by lurking in locations where people are urinating or are likely to have an urge to urinate.