Anti-pornography psychologist Ana Bridges and colleagues conducted a content analysis of best-selling heterosexual pornographic videos showing that over 96% of all scenes concluded with a male performer ejaculating onto the body of his female partner. In D/S, the Dominant is the Top and the submissive is the Bottom. A glory hole is a hole in a wall, 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. Simultaneous penetration of the vagina by two penises or other objects. Seconds after being deposited onto the face, the semen thickens, before liquefying 15–30 minutes later. It has been described as professionally made porn which seeks to emulate the style of amateur pornography. Anal sex without protection of a condom is considered the riskiest form of sexual activity, and gay hentai therefore health authorities such as the World Health Organization recommend safe sex practices for anal sex. Interracial pornographic celebrity gossip films have experienced an explosion in popularity, becoming one of the fastest-growing and biggest-selling genres. The performance of a facial is typically preceded by activities that result in the sexual arousal and stimulation of the ejaculating participant. These disappeared momporn with a crackdown celebrity porn on pornography gay cock in the late 1950s. However, that term is usually applied to a male who observes somebody secretly and, generally, not in a public place. Discipline often incorporates sadomasochistic aspects, though some sadomasochists distance themselves from D/s practices such as punishment. It is distinguished from these concepts in that the cuckold thrill in their partner acts is specifically masochistic; as such it is considered a category of BDSM fetish. In naked celebrities 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.