The naked appearance of actress Demi Moore in the advanced stage of pregnancy on the cover of Vanity Fair magazine in 1991 marked the beginning of a period which has since seen pregnancy presented by celebrities as a glamorous state of living, while also creating a market for photographers to produce images of pregnant mothers, and for fashion stylists to introduce pregnancy styling to their business. However, gay pornography in the modern world is mostly concentrated in the making of home videos , cable broadcast and emerging video on demand and wireless markets, as well as images and movies for viewing on the Internet. By comparison, gonzo pornography puts the camera right into the action, often with one or more of the participants both filming and performing sexual acts, without the usual separation between camera and performers seen in conventional porn and cinema. Biological anthropologist Helen B. These styles are much closer to the style of bondage scenes in mainstream television. In the 18th and 19th centuries, some European theologians and physicians described it as heinous, deplorable, and hideous, 3d hentai but during the 20th century, these taboos generally declined. Some POV/gonzo porn sometimes breaks the strict point-of-view convention. A study momsex of the condom usage habits of New Zealand sex workers said that they offered various safe sex alternatives to vaginal sex to clients who refused to wear a condom. The term has origins gay cock in the Greek language . Reality pornography is a genre of pornography where staged scenes, usually shot in cinéma vérité fashion, set up and precede sexual encounters. Group sex also occurs in populations of non-human animals such as bonobo apes and chimpanzees. In Japan, point of view pornography is referred to as hamedori . The term BDSM dates back to 1969; however, the origin of the term BDSM is unclear and is believed to have been formed either from joining the term B&D with S&M , or as a compound initialism from B&D, D&S , and S&M.