For circumcised males, on whom the glans is mostly or completely uncovered, this technique creates more direct contact between the hand and the glans. Lying face down one may use the hands, one may straddle a pillow, the corner or edge of the bed, a partner leg or some scrunched-up clothing and hump the vulva and clitoris against it. The term bondage describes the practice of Physical restraining. At the end of the gaysex evening the female partners would randomly select keys from the bowl and leave with that key owner. Being forced to wear diapers as a form of humiliation is sometimes a behavior encountered in sexual masochism. It is geared towards heterosexual men, who most typically define a threesome as such. In Japanese, the term describes any type of perverse or bizarre sexual desire lesbian milfs or act; it does not represent a genre of work. Other fetish Bareback pornography features performers who are not wearing condoms. They may be noted for using risqué themes, graphic violence, sexuality or black comedy in a manner that is unsuitable for younger audiences. They may regard it as an enhancing element of their sex lives or as their primary form of sexual activity. Voyeur pornography may also include shots of topless women on topless beaches who are unaware of the cameras but may legally be photographed due to the public setting. Clothed female, naked male pornography features naked men and clothed women; typically, the women humiliate and abuse the men or perform fellatio and/or handjobs on the men. The glans itself may widen and lengthen as the stimulation continues, becoming slightly darker in colour, while the gliding action of the foreskin reduces friction. 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. The term has also applied to other professions and even companies trying 3d hentai to appeal to a gay demographic. Breast fetishism is a paraphilic sexual interest focused on female breasts .