In the context of consensual erotic activities, sadism and masochism are not strictly accurate terms; there is a significant difference from the medical or psychological usage of both terms. Sex experts have praised various techniques that the performer can use during fellatio to increase their partner pleasure. These scenes may either have the cameraman directly engaging in sex or merely filming others having sex. Bhabha, Anne McClintock and Kobena Mercer. They cited the Internet and text messaging as common ways of organising meetings. The effect is to give the viewer the sense that they are experiencing the sex acts that they are watching, as opposed to simply watching others as a voyeur. Mutual masturbation is a sexual act where two or more people stimulate gay cock themselves or one another sexually, usually with the hands. One-sided male nudity can also arise when a male disrobes as part of a male striptease. 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. First found in softcore hentai sex movies and erotic thrillers, depictions of lesbianism entered mainstream cinema naked milf in the 1980s. Sub-genres of Japanese porn Among the various sub-genres of Japanese pornography are the following: Lolicon ロリコン: This genre involves prepubescent and adolescent girls between the aged of 6-12. Currently, animated television series aimed at adults are some of the most popular and critically acclaimed forms of entertainment. But starting with The World Biggest Gangbang , starring Annabel Chong, the pornographic industry began producing a series of films ostensibly setting gangbang records for most consecutive sex acts by one person in a short period. Bukkake, Gokkun, Omorashi, and tentacle erotica are few uniquely Japanese genres known to western viewers.