A glory hole is a hole in a wall, momsex or other partition, often between public lavatory stalls or adult video arcade booths for people to engage in sexual activity or observe the person in the next cubicle while one or both parties masturbate. Ethnic pornography is a genre of pornography that features performers of specific ethnic groups, or depictions of interracial sexual activity. Erotic spanking is the act of spanking another person for the sexual arousal or gratification of either or both parties. In the 1970s, the hardcore pornography genre introduced the stereotypical cumshot scene as a central element of the hardcore film, in which the male actor ejaculates in a way ensuring maximum visibility of the act itself. The nipples are erogenous zones, and vigorous stimulation of videos porno gay them during masturbation usually causes the penis to become erect more quickly than it would otherwise. Unlike erotic films, pornographic films contain explicit sexuality and do not claim any artistic merit. As of 2010, they were reported to live together as a monogamous couple outside of their porn careers and want to continue working together for another 50 years. Boot fetishism is a sexual fetish dedicated to boots. Buck Angel is the best-known gay hentai actor in this genre. In gay pornographic movies, actors who identify themselves as heterosexual, but who nevertheless perform explicit sexual acts with other males on film do not face the same stigmas as the mainstream acting counterparts and indeed can rise quickly to being featured actors. Human urinal: An act common in the bondage sex community where a male or female slave will serve as a urinal for a dominant partner. Masturbation has been depicted in art since prehistoric times and is mentioned and discussed in very early writings. One or more of the participants may engage in autoerotic sexual activity, such as masturbation, possibly without physical contact with the other participants. Can also include auto-fellatio, or performing oral sex on oneself.