But starting with The World Biggest Gangbang , starring Annabel Chong, the pornographic industry began producing a series of films ostensibly setting gangbang records for most consecutive sex acts by one person in a short period. Women porn is often produced by women and aimed specifically at the female market - rejecting the view that men are turned on by porn but women only by a box of chocolates. Facial cum shots are currently regularly gay video portrayed in pornographic films and videos, often as a way to close a scene. Twink pornography features younger performers, and usually features young men under 30 who identify as gay or bisexual. Unlike erotic films, pornographic films contain explicit sexuality and do not claim any artistic merit. In human sexuality, a threesome is sexual activity that involves three people at the same time. Heterosexual bareback sex, as opposed to sex with condoms, not only poses an increased risk of STIs, but for pregnancy as well. Some techniques which may work for one individual can be difficult or uncomfortable for another. By Japanese law, the genitals of actors and actresses must be censored and up the mid-1990 so was the depiction of pubic hair. It is sometimes described as a sexual fantasy, by women or men, depicting an exhibitionist or physique worship scenario. These scenes may involve the female actor calling for the shot to be directed at some specific part of her body. Body parts including fingers, tongue and penis may be used for anonymous oral, vaginal and/or anal intercourse. Actual upskirt or downblouse shots may violate privacy laws in some countries. In more vigorous forms of fisting, such as punching or punchfisting, a fully clenched fist may be inserted and withdrawn slowly. Boot fetishism is a sexual fetish dedicated to boots. For other scenes, particularly in established relationships, a safeword may be agreed to signify a warning rather than explicit withdrawal of consent; and a few choose not to use a safeword at all. 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.