Coprophilia , also called scatophilia or scat , is the paraphilia involving sexual arousal and pleasure from feces. In recent years, however, many celebrities have benefited from the publicity resulting from the release of a sex tape. The cover is open while the submissive lies down on his back and places his head in the box. Female masturbation involves the stroking or rubbing of a woman vulva, especially her clitoris, with an index or middle fingers, or both. Lying face down one may use the hands, one may straddle a pillow, the corner or edge of the bed, a partner leg or some scrunched-up clothing and hump the vulva and clitoris against it. Jeffrey Masson has even argued that incest porn is the very nucleus of pornography — its prototypical form. There are various subcultures under this umbrella term and distinct difference between these subcultures. In hentai videos some creampie films, both gay and straight, intercourse and internal ejaculation are followed by performers licking up the semen that has dripped from their bodies. This technique is also used by some men who are circumcised who have excess skin left from circumcision. Studies have found that masturbation is frequent in humans of both sexes and all ages, although there is variation. A person may be sexually penetrated multiple times simultaneously. The allusion is to the use of hemp rope for restraining prisoners, naked milf as a symbol of power, in the same way that stocks or manacles are used in a Western BDSM context. Medical pornography involves sexualized medical, often fake, including gynecological pelvic examinations, rectal examinations, and pelvic or gynecological ultrasounds. In a few relationships, it leads as far as total submission of one partner videos porno gay in the truest sense of the phrase total power exchange . As the prostate is touch-sensitive, some directly stimulate it using a well-lubricated finger or dildo inserted through the anus into the rectum. Ass to mouth is a slang term primarily used to describe the withdrawal of a penis from the receptive partner anus followed by the immediate insertion into the receptive partner mouth.