Anti-pornography psychologist Ana Bridges and colleagues conducted a content analysis of best-selling heterosexual pornographic gay twink porn videos showing that over 96% of all scenes concluded with a male performer ejaculating onto the body of his female partner. Typically features a feminine Uke, or submissive, and a masculine Seme, or dominative. Bukkake pornography usually depicts numerous men having sex with one woman, with multiple, usually 10 or more, men ejaculating on the female face. 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. The anal and rectal tissues are delicate and do not provide natural lubrication, so they can easily tear and permit disease transmission, especially if lubricant is not used. The term shemale has been used since the mid-19th century, when it was a humorous colloquialism for female, especially an aggressive woman. Given the wide range of practices, some of which may be engaged in by people who do not consider themselves as practicing BDSM, inclusion in the BDSM community or subculture is usually dependent on self-identification and shared experience. 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. The shocker accomplishes this using several fingers of one hand. Pleasure for the giver during anilingus is usually based more on the principle of the act. Sexual scenarios nude milfs may involve male domination, female submission, exhibitionism and erotic entertainment. Fetish cuckolding can have a wide range of expression, from pillow-talk fantasy between monogamous partners to extreme alternative lifestyles, depending on the couple. Also see POV. Asian gay hentai fetish is a slang term which usually refers to an interest, strong attraction or preference for people, culture, or things of Asian origin by those of non-Asian descent. Pornography is the portrayal of sexual subject matter for the purpose of sexual arousal.