Snuff pornography involves the actual death of any of the participants, consenting or otherwise, simulated death is not considered snuff. The nipples are erogenous zones, and vigorous stimulation of them during masturbation usually causes the penis to become erect more quickly than it would otherwise. Fisting pornography features the insertion of an entire hand into a performer vagina or anus. Hentai is the various forms gaysex of Japanese pornography, including H-manga, H-anime, and H-computer games. Japanese rope bondage is distinguished by its use of specific katas and aesthetic rules. In addition to mainstream pornography, the popularity of facials has led to creation of its own niche market, like video series that specialize in showing the act. Using the term shemale for a transsexual woman often implies that she is working in the sex trade. Body parts including fingers, tongue and penis may be used for anonymous oral, vaginal and/or anal intercourse. BDSM is a variety of erotic practices involving dominance and submission, role-playing, restraint, and other interpersonal dynamics. Since development and pronunciation of the buttocks begins at menarche momsex and declines with age, full buttocks are also a symbol of youth. When all regions of the face are included, facial cum shots comprise approximately 62% of scenes where external ejaculation occurs. Transsexual people Transman pornography features performers who were born female and who medically transitioned hentai movies to male. Can also include auto-fellatio, or performing oral sex on oneself. Arousal may be triggered by seeing the body movements or facial expressions of that person. This technique may include the use of a simulacrum, or artificial vagina. As in B/D, the declaration of the Top/Bottom may be required, though sadomasochists may also play without any Power Exchange at all, with both partners equally in control of the play. This may relate to fetishes such as voyeurism or cuckolding. Some restrict a policy of panties/nipple tape for females and some allow full nudity with explicit sexual interaction allowed.