On May 27, 2010 the television program The Doctors discussed the topic with dozens of teens, parents, and professionals. Common phrases used to refer to these individuals are chicks with dicks or the derogatory term shemale, although these are generally considered pejorative among transwomen. Felching is a sexual practice involving the act of orally sucking semen out of the vagina or anus of one partner. The loose and direct camera work lesbian milfs often includes tight shots of the genitalia, unlike some traditional porn. This genre also features male-on-male gay cock fellatio through a small hole made in a bathroom divider. There is, however, no third party camera work involved. Studies have found that masturbation is frequent in humans of both sexes and all ages, although there is variation. Sometimes one or more fingers may be inserted into the vagina to stroke its frontal wall where the G-spot may be located. Mutual masturbation, mutual manual stimulation of the genitals between partners, can be a substitute for sexual penetration. Some masturbate only using pressure applied to the clitoris without direct contact, for example by pressing the palm or ball of the hand against underwear or other clothing. Such ejaculation can be done by mammary intercourse, or masturbation over the other person, or result from the withdrawal of the penis from a partner mouth as he is ejaculating following fellatio, irrumatio, or intercourse. The activity is done by itself or as a part of or prelude to other activities which many times involve sex. Sadism describes sexual pleasure derived by inflicting pain, degradation, humiliation on another person or causing another person to suffer. This is commonly called double vaginal penetration or double stuffing. As a form of non-penetrative sex, it can be done for its own enjoyment or as foreplay. Irrespective hentai porn of the legal or social view of pornography, it has been used in a number of contexts. Hermaphrodite, also known as herm, refers to pornography, typically hentai, that features persons with the genitalia of both sexes.