Body parts including fingers, tongue and penis may be used for anonymous oral, vaginal and/or anal intercourse. Arguably the most famous example of the genre is the Taboo series. The person sat upon may be in bondage, sexually submissive, or simply held down by the body-weight of the other person. The stimulation may involve hands, fingers, everyday objects, sex toys or combinations of these. Rough sex pornography is similar to pornography featuring sadomasochism, and typically features a Top who humiliates and/or degrades a Bottom while being physically violent towards them. Futanari, Hentai females with a penis. A smotherbox has two openings. One or more of the participants may engage in autoerotic sexual activity, such as videos gays masturbation, possibly without physical contact with the other participants. Though the term anal sex most commonly means penile-anal penetration, hentai porn sources sometimes use the term anal intercourse to refer exclusively to penile-anal penetration, and anal sex to refer to any form of anal sexual activity, especially between pairings as opposed to anal masturbation. When sexual activity is centered on one of the threesome, then the activity may be described as a gang bang of the person. As amateurs in a single segment of a multi-part video, the actresses are typically paid momporn only about 50,000 yen . Anal sex or anal intercourse is generally the insertion and thrusting of the erect penis into a person anus, or anus and rectum, for sexual pleasure. Freud, however, considered such extensions of sexual interest to fall within the range of the normal, unless marked out by exclusivity . 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. Men and women may masturbate until they are close to orgasm, stop for a while to reduce excitement, and then resume masturbating. Well-known female porn stars who expressed their pleasure in pegging their male partners include Taylor Wane, Debi Diamond, Brittany Andrews, and Monique Covét.