BDSM is a variety of erotic practices involving dominance and submission, role-playing, restraint, and other interpersonal dynamics. Incest pornography can feature actual relatives, but the main type of this pornography simply uses actors of similar looks to suggest family relationship. Arousal may be triggered by seeing the body movements or facial expressions of that person. In human sexuality, a threesome is sexual activity that involves three people at the same time. Tentacle rape or shokushu goukan is found in some horror or hentai titles, with tentacled creatures having sexual intercourse with female characters. Such films continued to be produced but could only be distributed by underground channels. Currently, animated television series aimed at adults are some of the most popular and critically acclaimed forms of entertainment. Reflective of its views on sexuality and culture, Japanese pornography delves into a wide spectrum of heterosexual, homosexual, and transgender sexual acts in addition to unique fetishes and philias. The prostate gland is one of the organs that contributes fluid to semen. The scenario is a genre of erotica, which on the internet is sometimes abbreviated to CMNF, and may involve sexual and nonsexual erotic scenarios. People may engage in anilingus for its own sake, before anal fingering or penetration, or as part of foreplay. Originating lesbian hentai in Japan in the videos gays 1980s, the genre subsequently spread to North America and Europe, and crossed over into gay pornography. This category also includes pornographic home movies. Actual spying may violate privacy and/or trespassing laws in many countries. For legal reasons, the vast majority of so-called reality porn involves momsex professional actors and actresses posing as so-called amateurs. Some BDSM practitioners prefer a code of behavior that differs from SSC and is described as risk aware consensual kink , indicating a preference for a style in which the individual responsibility of the involved parties is emphasized more strongly, with each participant being responsible for his or her own well-being.