Medical pornography involves gay fuck sexualized medical, often fake, including gynecological pelvic examinations, rectal examinations, and pelvic or gynecological ultrasounds. A scene where many women have sex with one man is referred to as a reverse gang-bang. The primary subjects of pornographic depictions are pornographic models, who pose for still photographs, and pornographic actors or porn stars, who perform in pornographic films. A study of 164 males in Finland from two SM clubs found that 18.2% had engaged in coprophilia; 3% as a sadist, 6.1% as a masochist, and 9.1% as both. 18% of heterosexuals and 17% of homosexuals in the study pool had tried coprophilia, showing no statistically significant difference between heterosexuals and homosexuals. Such works have also often been subject to censorship and other legal restraints to publication, display or possession. Real school shots or videos which are sexualized may violate privacy laws in some countries. Sadomasochism refers to the aspects of BDSM surrounding the exchange of physical or emotional pain. In Japanese, the term describes any type of perverse or bizarre sexual desire or act; it does not represent a genre of work. This is commonly called double vaginal penetration or double stuffing. The loose and direct camera work often includes tight shots of the genitalia, unlike some traditional porn. Today, religions vary in their views of masturbation; some view it as a spiritually detrimental practice, some see it as not spiritually detrimental, and others take a situational view. A study of the condom usage habits of New Zealand sex workers said that they offered various safe sex alternatives nude milfs to vaginal sex to clients who refused to wear a condom. Although there may be no connection between coprophilia and sadomasochism gay hentai , the limited data on the former comes from studies of the latter. Reality and voyeur pornography, animated videos, and legally prohibited acts also influence the classification of pornography. Threesome or 3some pornography features one man and two women .