Mutual masturbation can be practiced by males or females in pairs or groups with or without actually touching another person as indicated by the following examples of contact versus non-contact scenarios: Non-contact mutual masturbation Two people masturbating in the presence of each other but not touching. Real jail or prison or police station shots or videos may violate laws in some countries. Enema pornography involves adults given enemas to others, often fake. It spawned numerous sequels, several of which won adult film awards. There is no singular or archetypical behavior; therefore, a wide range of thought patterns and behaviors exist, but all tends to be a harmless and efficacious release from some kind of pressure. First found in softcore movies and erotic thrillers, depictions of lesbianism entered mainstream cinema in the 1980s. However the genre remains a very small proportion of the pornographic DVD market; for example at porn retailer HotMovies. Participants usually derive pleasure from this, even though many of the practices—such as inflicting pain or humiliation or being restrained—would be unpleasant under other circumstances. Bareback sex is physical sexual activity, especially sexual penetration, without the use of a condom. The buttocks in human females thus contain more adipose tissue than in males, especially after puberty. An orgy is a gathering where guests freely engage in open and unrestrained sexual activity or group sex; and a bunga bunga orgy is an orgy in which nude milfs participants have sex underwater, such as in a swimming pool or a hot tub. Fisting pornography features the insertion of lesbian hentai an entire hand into a performer vagina or anus. The consent and compliance for a sadomasochistic situation gaysex can be granted only by people who can judge the potential results. It can be combined with fellatio and the woman may move her breasts up and down on the penis for an additional stimulation, usually before the man reaches orgasm. Tentacle rape or shokushu goukan is found in some horror or hentai titles, with tentacled creatures having sexual intercourse with female characters.