The smotherbox is placed on a stable surface. Since the 1980s, many practitioners and organizations have adopted the motto safe, sane and consensual, commonly abbreviated as SSC, which means that everything is based on safe activities, that all participants gay twinks be of sufficiently sound/sane mind to consent, and that all participants do consent. The most common type of erotic spanking is administered on the bare buttocks, but can also be combined with bondage, in order to heighten sexual arousal and feelings of helplessness. Bondage/BDSM Bondage pornography features performers tied up or constrained in various ways. The genres of pornography are based on the type of activity featured and the category of participants, for example mateur pornography is a category of pornography that features models, actors or non-professionals performing without pay, or actors for whom this material is their only paid modeling work. Fisher said that perhaps, the fleshy, rounded buttocks attracted males during rear-entry intercourse. The term is typically used by the cinematographer within the narrative framework of a pornographic film, and since the 1970s has become a leitmotif of the hardcore genre. Common phrases used to refer to these individuals are chicks with dicks or the derogatory term shemale, although these are generally considered pejorative among transwomen. The porn industry and viewing public were shocked by the then-taboo spectacle of a white woman having sex with a black man. Both forms of pornography generally contains nudity. The term applies to the depiction of the act rather than the act itself, and so does not include live exhibitions like sex shows and striptease. In academic discourse, racial fetishism is a postcolonialist term found in the writings of authors such as Homi K. There has been an increase in discussion and portrayal of masturbation in art, popular music, television, films, lesbian hentai and literature. It is sometimes combined with BDSM features. Other objects such as ball point pens and thermometers are sometimes momporn used, although this practice can lead to injury and/or infection.