Diaper pornography involves performers wearing diapers, sometimes with an adult performer acting in the role of a caretaker. Transsexual porn star Wendy Williams has stated that transsexual Porn is classified as Straight Specialty. Many cultures describe pain as gay twink porn an aphrodisiac. However, bisexual pornography is often placed near the gay section in adult video stores, since many consumers are gay men. It is sometimes combined with BDSM features. For circumcised males, on whom the glans is mostly or completely uncovered, this technique creates more direct contact between the hand and the glans. Real medical shots or videos may violate privacy laws in some countries. Bukkake is a sex act portrayed in pornographic films, in which several men ejaculate on a woman, or another man. Sexual orientation Pornography features an increasing variety of combinations of actors by their sexual orientation such as lesbian, gay, bisexual, and transsexuals in addition to traditional heterosexual roles. Among swinging couples, one of the two partners is often the driving force and the other is more passive-supportive of the addition of additional sex parties. Women oriented pornography is sometimes referred to as sex positive pornography. The first explicit pegging scene is believed to have been in the 1975 pornographic film The Opening of Misty Beethoven. Some anthropologists and sociobiologists believe that breast fetishism derives from the breasts similarity to buttocks, but instead provide sexual attraction from the front of the body. Once insertion is complete, the fingers are either clenched into a fist or kept straight. Jerk off instruction features a performer encouraging hentai sex or instructing the viewer to masturbate, often culminating in a countdown at the end of which the viewer is invited to induce orgasm. The industry generally refers to such films as adult films, which is part of adult entertainment. Pussing: British expression for an activity involving a consenting couple where the male partner watches the woman urinate otherwise undetected in a semi-public place, usually a toilet cubicle at a pub, momporn hotel, restaurant, theatre/cinema, office, club etc.