Bukkake pornography involves a performer, usually female, onto whom several men or women ejaculate, usually on the face. A study 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. These actors often play the top roles but this is not always the case, such as with Kristen Bjorn and some Bel Ami models. 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. In Japan, point of view pornography is referred to as hamedori . Female masturbation involves the stroking or rubbing of a woman vulva, especially her clitoris, with an index or middle fingers, or both. Shotacon : Similar to Lolicon, this genre involves prepubescent or under-aged boys between the ages 6–12. Clothed female, naked male pornography features naked men and clothed women; typically, the women humiliate and abuse the men or perform fellatio and/or handjobs on the men. On the other hand, lesbian milfs the masochist enjoys being hurt, humiliated, gay sex video or suffering within the consensual scenario. As the prostate is touch-sensitive, some directly stimulate it using a well-lubricated finger or dildo inserted through the anus into the rectum. In contrast, a celebrity may take the route of openly releasing the tape and benefit directly from royalties as well as indirectly from the publicity. Instead, all five fingers are kept straight and held as close together as possible gay hentai , then slowly inserted into a well lubricated vagina or rectum. Reality pornography is a genre of pornography where staged scenes, usually shot in cinéma vérité fashion, set up and precede sexual encounters. The term bondage describes the practice of Physical restraining. Diaper fetishism, nappy fetishism or diaperism, is a sexual fetish in which a person feels a desire to wear or use diapers. In the West, masturbation in private or with a partner is generally considered a normal and healthy part of sexual enjoyment.