Animal masturbation has been observed in many species, both in the wild and in captivity. Bottom and submissive are widely recognized terms for those partner in the relationship or activity who are, respectively, the physically receptive or controlled participants. 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. Generally, interest differs between people, and gender depends on sexual orientation. Real enema shots or videos of true medical situations may violate privacy laws in some countries. Hentai is the various forms of Japanese pornography, including H-manga, H-anime, and H-computer games. These scenes may involve the female actor calling for the shot to be directed at some specific part of her body. Examples include the Girls Gone Wild and Girls Who Like Girls Series. Snuff pornography involves the actual death of any of the participants, consenting or otherwise, simulated death is not considered snuff. Transsexual people Transman pornography features performers who were born female and who medically transitioned to male. Softcore gay pornography also exists; it at one time constituted the genre, and may be produced as beefcake pornography for heterosexual female and homosexual male consumption. Interracial pornographic films have experienced an explosion in popularity, becoming one of the fastest-growing and biggest-selling videos porno gay genres. Lesbianism has been a theme in erotic naked milf art since at least the time of ancient Rome, and many regard depictions of lesbianism to be erotic. Bondage/BDSM Bondage pornography features performers tied up or constrained in various ways. A homosexual threesome lesbian hentai would involve either three men or three women. Comic books often featured characters being tied up and tying others up, particularly in damsel in distress plots. Another variant of reality pornography consists of normal couples that are filmed by professionals, in which case the only obvious distinction from amateur pornography is the higher quality of production, filming and editing.