Some BDSM practitioners prefer a code of behavior that differs from SSC and is described as risk aware consensual kink , indicating a preference for a style in which the individual responsibility of the involved parties is emphasized more strongly, with each participant being responsible for his or her own well-being. Mutual masturbation is a sexual act where two or more people stimulate themselves or one another sexually, usually with the hands. There is also some evidence that pornography can be used to treat voyeurism. Emetophilia horny milfs pornography involving vomiting and gagging. Fisting pornography features the insertion of an entire hand into a performer vagina or anus. The principal characteristic of voyeurism is that the voyeur does not normally interact directly with the subject of his/her interest, who is often unaware of being observed. Amateur porn has been called one of the most profitable and long-lasting genres of pornography. It may be used as foreplay, videos gays or as an alternative to sexual penetration. Unlike the traditional hentai sex definition of the term, in fetish usage a cuckold is complicit in their partner sexual infidelity and takes masochistic sexual pleasure in it. Another variant of reality pornography consists of normal couples that are filmed by professionals, in which case the only obvious distinction from amateur pornography is the higher quality of production, filming and editing. Along with the penis, the scrotum is sensitive and considered to be an erogenous zone. Insertion in pornography features women inserting various odd objects into their anus or vaginas. A variation on this is to place the fingers and thumb on the penis as if playing a flute, and then shuttle them back and forth. Gloryhole pornography features women performing fellatio on unidentified men through a small hole made in a bathroom divider. Clothed female, naked male is a genre of erotica featuring one or more nude men and one or more clothed women. Technically this is a form of exhibitionism rather than group sex per se.
