The consent and compliance for a sadomasochistic situation can be granted only by people who can judge the potential results. Such explicit sexual interaction is seen only rarely in public play spaces, and it is sometimes specifically banned by the rules of a party or playspace. There is also some evidence that pornography can be used to treat voyeurism. Pornography is often referred to as porn and a pornographic work as a porno. Depictions of male and female masturbation are common in pornography, including gay pornography. The term lesbian is also used with regard to sexual identity or sexual gay sex behavior, regardless of sexual orientation, or as an adjective to characterize or associate nouns with female homosexuality or same-sex attraction. Sometimes special furniture is used, such as a queening stool or smotherbox. Interracial pornographic films have experienced an explosion in popularity, becoming one of the fastest-growing and biggest-selling genres. The person receiving anilingus is regarded as the passive partner in the act, and the person performing anilingus is the active partner. The buttocks in human females thus contain more adipose tissue than in males, especially after puberty. Going back at least as far as the Christy twins in the 1970s, depictions of incest and particularly incest between twins has been a feature of gay pornography. Bara male homosexual hentai designed to appeal to men. It may be regarded as taboo or unnatural, and is a criminal offense in some countries, punishable by corporal or capital punishment; by contrast, people also regard anal sex as a natural and valid form of sexual activity that may be as equally fulfilling as any other desired sexual expression. Bareback sex is physical sexual activity, especially sexual penetration, without the use of a condom. Examples include the Girls Gone Wild and Girls Who Like Girls Series. Tentacle rape or shokushu goukan is found in some horror or hentai titles, with tentacled creatures having sexual intercourse with female characters.