Yiff or Yiffy pornography features Furry or anthropomorphic animals in an erotic or sexual context. Fisting, handballing, fist-fucking, brachiovaginal, or brachioproctic insertion is a sexual activity that involves inserting a hand into the vagina or rectum. Fisting pornography features the insertion of gay movies an entire hand into a performer vagina or anus. Lesbians may encounter distinct physical or mental health concerns arising from discrimination, prejudice, and minority stress. In gay pornographic movies, actors who identify themselves as heterosexual, but who nevertheless perform explicit sexual acts with other males on film do not face the same stigmas as the mainstream acting counterparts and indeed can rise quickly to being featured actors. Also see POV. 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. The Japanese sex industry uses the term Paizuri . The meaning of hentai is perversion, abnormality, or metamorphosis. Ethnic pornography is a genre of pornography that features performers of specific ethnic groups, or depictions of interracial sexual activity. As observation is encouraged, porn milf voyeurism and exhibitionism are closely associated with dogging. Kinbaku is a Japanese style of bondage or BDSM which involves tying up the bottom using simple yet visually intricate patterns, usually with several pieces of thin rope . In these cases, the appearance of an enlarged abdomen caused by obesity or overeating may be sufficient, or simply the suggestion of a protruding gay hentai navel. Sexual scenarios may involve male domination, female submission, exhibitionism and erotic entertainment. An orgy is a gathering where guests freely engage in open and unrestrained sexual activity or group sex; and a bunga bunga orgy is an orgy in which participants have sex underwater, such as in a swimming pool or a hot tub. In recent years, Japanese films of this genre have become more common in the USA and Europe although it still remains a small, fetish-oriented part of the adult film industry.