Men may find stimulation of the anus, rectum, and adjacent organs enjoyable. 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. Rainbow parties were covered on The Oprah Winfrey Show in 2003, and became the subject of a juvenile novel called Rainbow Party. Pro-am pornography is sub-genre of amateur pornography that refers to professionally made porn that features amateur actors/actresses, hentai movies often appearing gay twinks for the first time in a pornographic film. These scenes may involve the female actor calling for the shot to be directed at some specific part of her body. Often, strong views are expressed 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. The scenario is a genre of erotica, which on the internet is sometimes abbreviated to CMNF, and may involve sexual and nonsexual erotic scenarios. It is used, for example, at fertility clinics to stimulate sperm donors. Sub-genres can also be classified into the characteristics of the performers or the type of sexual activity on which it concentrates, and not necessarily on the market to which each sub-genre appeals. Women who perform in lesbian pornography often do not consider themselves lesbian or bisexual. Particular areas and processes of the body that change during pregnancy may also become the focus of psychological investment, but nudity or sexual activity is not always essential, and in some cases actual pregnancy is not necessary to invoke arousal. In modern BDSM vernacular, the queening stool allows open access to the crotch while seated. It has also been recommended as a form of foreplay or safer sex. This stop and go momporn build-up, known as edging, can achieve even stronger orgasms.