Targets the male audience, but is much less popular than Yaoi. In the context of consensual erotic activities, sadism and masochism are not strictly accurate terms; there is a significant difference from the medical or psychological usage of both terms. One or more of the participants may engage in autoerotic sexual activity, such as masturbation, possibly without physical contact with the other participants. The effect is to give the viewer the sense that they are experiencing the sex acts that they are watching, as opposed to simply watching others as a voyeur. Making a pearl necklace is one of the activities that sex workers use as safe sex alternatives for people who refuse to wear condoms. 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. POV pornography involves camera angles designed to provide the viewer a view similar to that seen by one of the participants, whose face is never shown. Hentai is the various forms of Japanese pornography, including H-manga, H-anime, and H-computer games. Real jail or prison or police station shots or videos may violate laws in some countries. Some couples use a threesome as a way to develop a gay bear porn mobile porn tubes love triangle . The higher mature milfs pay scale and profile within a production often leads to group scenes where a straight actor only tops. Buck Angel is the best-known actor in this genre. Since at least 1973, it has also been used to refer to a sexually attractive young woman. Lesbian pornography made for women is usually made by women, and usually features women who identify as lesbian or bisexual. Sometimes special furniture hentai movies is used, such as a queening stool or smotherbox. Partners can engage in penetrative sex, known as full swap, or choose to soft swap in which they engage only in non-penetrative sex. Sub-genres of Japanese porn Among the various sub-genres of Japanese pornography are the following: Lolicon ロリコン: This genre involves prepubescent and adolescent girls between the aged of 6-12.