This technique may include the use of a simulacrum, or artificial vagina. This is why video stores might consider stocking transgendered subject matter in the straight section, as some straight men will have passive or active sex with another man as long as their partner appears to look like a woman to them, to some minor or major degree. 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. 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. Male masturbation may differ between males who have been circumcised and those who have not. Initially, few animation studios in the United States attempted to produce animation for adult gay bear porn audiences, but later examples of animation produced for adults would gain mainstream attention and success. Jail/Prison/Police pornography involves people in police custody or inmates in jails or prisons in various sexual situations, such as strip searches or body cavity searches. The most common depiction of a hermaphrodite is a person with a female face, breasts, and build, and a penis , although there are other combinations. First found in softcore movies and erotic thrillers, depictions of lesbianism entered mainstream cinema in the 1980s. 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 some areas, there are laws stating it is not legally possible lesbian milfs to consent to be killed, and elsewhere it may still be legally dubious . Pornographic films are generally classified into sub-genres which describe the sexual fantasy which the film and actors attempt to create. Failure to hentai movies honor a safeword is considered serious misconduct and could even change the sexual consent situation into a crime, depending on the relevant law, since the bottom has explicitly revoked his or her consent to any actions that follow the use of the safeword .