Group sex is sexual behavior involving more than two participants. Omorashi: The act of holding one own urine until the need to urinate is urgent, making another hold in their urine, or watching another person with an urgent need to urinate. These scenes may either have the cameraman directly engaging in sex or merely filming others having sex. Pornographic films present sexual fantasies and usually include erotically stimulating material such as nudity. Pornography in Japan is large and intertwined business of adult entertainment with unique characteristics that readily distinguish it from western pornography. Comic books often featured characters being tied up and tying others up, particularly in damsel in distress plots. This style of filming is in contrast to having a separate, third-person young gay porn camera momporn crew filming all the action. Bhabha, Anne McClintock and Kobena Mercer. Terminology for roles varies widely within the various BDSM subcultures. The phrase is commonly found on porn sites. It is sometimes combined with BDSM features. Sexologist Alfred Kind suggested that the buttocks is the primary sexual presentation site in primates. The prostate gland is one of the organs that contributes fluid to semen. Internal ejaculations, followed by images of semen dripping from the anus, are sometimes depicted in bareback gay pornography, where they are referred to by the term breeding or the reverse money shot. Examples include the Girls Gone Wild and Girls Who Like Girls Series. The lesbian hentai consent and compliance for a sadomasochistic situation can be granted only by people who can judge the potential results. As of 2013, little analysis of this paraphilia has been reported in medical literature. Adult animation is genre of animation geared towards adults and sometimes teens. Related genres include: Amateur pornography originally referred only to pornography produced by amateurs but now also includes professionally made pornography designed to appear as if it were amateur. Saliva pornography involves salivation and saliva.