In general, as compared to conventional relationships, BDSM participants go to great lengths to negotiate the important aspects of their relationships in advance, and to take great care in learning about and following safe hentai movies practices. Shotacon : Similar to Lolicon, this genre involves prepubescent or under-aged boys between the ages 6–12. Medical pornography involves sexualized medical, often fake, including gynecological pelvic examinations, rectal examinations, and pelvic or gynecological ultrasounds. The name was coined from the title of the controversial book. While some fantasize about a giantess who is slightly taller than himself, others are interested in giantesses that are hundreds or even thousands of feet tall. Hermaphrodite, also known as herm, refers to pornography, typically hentai, that features persons with the genitalia of both sexes. It may occur more frequently in private situations, such as spontaneous sexual activity among three friends, or arranged in a community of like-minded swingers or planned as a once-only experience; and rarely in anonymous settings, such as at orgies or other sex parties. Examples of mentally oriented practices are education games, during which the dominant requires certain forms of behavior from the submissive. Gay pornography is the representation of sexual activity between males. Some people get sexual pleasure gay sex video by inserting objects, such as urethral sounds, into the urethra , a practice known as urethral play or sounding. Group sex also occurs in populations of non-human animals such as bonobo apes and chimpanzees. Works in this genre may be considered adult for any number of reasons. To avoid soreness from this resulting friction, some may prefer to use a personal lubricant, masturbation cream or saliva during masturbation. Being forced to wear diapers as a form of humiliation is sometimes a behavior encountered in sexual masochism. Preggo pornography features pregnant performers and may include erotic lactation horny milfs as a fetish.