Although pornography has usually focused on heterosexuality, due to the prevalence of the heterosexual orientation, explicit gay material has a long history as well, which reaches back to Greek antiquity, if not to prehistory. Saliva pornography nude milfs involves salivation and saliva. 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 be of sufficiently sound/sane mind to consent, and that all participants do consent. A sub-set of vaginal fisting attempts to photograph the female cervix immediately after the fist is removed from the now-gaping vagina. This industry employs thousands of performers along with support and production staff. A variant of A2M is ATOM where a performer inserts his penis directly from one recipient anus into a second recipient mouth. It is used, for example, at fertility clinics to stimulate sperm donors. Adult animation is genre of animation geared towards adults and sometimes teens. Films with risqué content commenced to be produced soon after the invention of the motion picture in the 1880s. 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. It is sometimes combined with BDSM features. Generally, interest differs between hentai videos people, and gender depends on sexual orientation. Often, strong views are expressed gay bear porn with regard to anal sex; it is controversial in various cultures, especially with regard to religion, commonly due to prohibitions against anal sex among gay men or teachings about the procreative purpose of sexual activity. A facial is a form of non-penetrative sex, though it is generally performed after some other means of sexual stimulation, such as vaginal sex, anal sex, oral sex or masturbation. A male voyeur is commonly labeled Peeping Tom, a term which originates from the Lady Godiva legend.