New York photographer Irving Klaw also published illustrated adventure/bondage serials by fetish artists Eric Stanton, Gene gay movies Bilbrew, Adolfo Ruiz and others. 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. Though hentai movies there have been numerous gang bang pornographic films since the 1980s, they usually involved no more than half a dozen to a dozen men. In general, BDSM play is usually structured such that it is possible for the consenting partner to withdraw his or her consent during a scene; for example, by using a safeword that was agreed on in advance. Fisher said that perhaps, the fleshy, rounded buttocks attracted males during rear-entry intercourse. There is, however, no third party camera work involved. The term pearl necklace is used by some because the drops of semen deposited by the man resemble a necklace of translucent white pearls. Being forced to wear diapers as a form of humiliation is sometimes a behavior encountered in sexual masochism. Women with women Main article: Lesbianism in erotica: Lesbianism in contemporary pornography Lesbian or girl-girl pornography features women engaged in sex together, but is typically aimed at a male audience. Examples of mentally oriented practices are education games, during which the dominant requires certain forms of behavior from the submissive. Pornography may fall into more than one genre. Contrary to the other two types, B/D does not define the Tops and Bottoms itself, and is used to describe the general activities with either partner being the receiver and the giver. Cum shots typically do not appear in girl-girl scenes and orgasm is normally implied by utterances, cinematic conventions, or body movement. In the fetish cuckolding subculture, it is most common for the female to take on the sexually dominant role and the male the submissive role, however, female subs, sometimes referred to as cuckqueans, naked milf also exist.