Heterosexual bareback sex, as opposed to sex with condoms, not only poses an increased risk of STIs, but for pregnancy as well. Simultaneous penetration of the mouth and either the vagina or anus. The wife who enjoys cuckolding her husband is frequently called a hotwife, or a cuckoldress if the man is more submissive. Related genres include: Amateur pornography originally referred only to pornography produced by amateurs but now also includes professionally made pornography designed to appear as if it were amateur. Because the viewing of such films carried a social stigma, they were viewed at brothels, adult movie theaters, stag parties, at home, in private clubs and also at night cinemas. Actual spying may violate privacy and/or trespassing laws in many countries. Voyeurism: Seeing another urinate without the person knowledge either through video taping by a hidden camera, or by lurking in locations where people are urinating or are likely to have an urge to urinate. 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. Men may find stimulation of the anus, rectum, and gay movies adjacent organs enjoyable. Some techniques which may work for one individual can be difficult or uncomfortable for another. This technique may include the use of a simulacrum, momsex or artificial vagina. Examples include the 3d hentai Girls Gone Wild and Girls Who Like Girls Series. Group sex is sexual behavior involving more than two participants. Originating in Japan in the 1980s, the genre subsequently spread to North America and Europe, and crossed over into gay pornography. A female dominant in a master/slave relationship is often termed a Mistress, not to be confused with the colloquial usage of mistress as a kept sexual partner without a similarly formalized power relationship.