Women who perform in lesbian pornography often do not consider themselves lesbian or bisexual. Ass to mouth pornography shows the transfer of a performer penis from a second performer anus to that same second performer mouth in a single shot. Men may also rub or massage the glans, the rim of the glans, and the frenular delta. The porn industry and viewing public were shocked by the then-taboo spectacle of a white woman having sex with a black man. Mammary intercourse is a sex act, performed as foreplay or as horny milfs non-penetrative sex, that involves the stimulation of the male penis by the female breasts and vice versa. In human sexuality, a threesome is sexual activity that involves three people at the same time. The scenario is a genre of erotica, which on the internet is sometimes abbreviated to CMNF, and may involve sexual and nonsexual erotic scenarios. Films with risqué content commenced to be produced soon after the invention of the motion picture in the 1880s. Normal quantities of ejaculate range from 1.5 to 5.0 milliliters . Both forms of pornography generally contains nudity. Stimulating the prostate from outside, via pressure on the perineum, can be pleasurable as well. Since the 1980s, many practitioners and organizations have adopted the motto safe, sane and consensual, commonly abbreviated as SSC, which means that everything gay cock is based on safe activities, that all participants be of 3d hentai sufficiently sound/sane mind to consent, and that all participants do consent. It is also followed by dedicated industry publications and trade groups as well as the mainstream press, private organizations , government agencies, and political organizations. A homosexual threesome would involve either three men or three women. Diaper pornography involves performers wearing diapers, sometimes with an adult performer acting in the role of a caretaker. In modern BDSM vernacular, the queening stool allows open access to the crotch while seated. Sadomasochism is practiced in isolation relatively rarely, though some masochists report biting, pinching, or even stun-gunning themselves as a prelude to, or as part of, masturbation.