The strategies and tactics that are used to smuggle one of the couple into and out of the toilet undetected are as important or almost as important as the urination. Real school shots or videos which are sexualized may violate privacy laws in some countries. Hermaphrodite, also known as herm, refers to pornography, typically hentai, that features persons with the genitalia of both sexes. Some anthropologists and sociobiologists believe that breast fetishism derives from the breasts similarity to buttocks, but instead provide sexual attraction from the front of the body. Bondage pornography specializes in the depiction of sexual bondage or BDSM activities as photographs, stories, movies, or drawings. For circumcised males, on whom the glans is mostly or completely uncovered, this technique creates more direct contact between the hand and the glans. This is commonly called double vaginal lesbian milfs penetration or double stuffing. By comparison, gonzo pornography puts the camera right into the action, often with one or more of the participants both filming and performing sexual acts, without the usual separation between camera and performers seen in conventional porn and cinema. Biological anthropologist Helen B. Diaper fetishism, nappy fetishism or diaperism, hentai porn is a sexual fetish in which a person feels a desire to wear or use diapers. In these research publications, it is suggested that real female ejaculation is the release of a very scanty, thick, and whitish fluid from the female prostate, while the squirting or gushing shown frequently young gay porn in pornography is a different phenomenon, the expulsion of clear and abundant fluid, cartoon porn comics which has been shown to be a diluted fluid from the urinary bladder. Preggo pornography features pregnant performers and may include erotic lactation as a fetish. Works in this genre may be considered adult for any number of reasons. The name was coined from the title of the controversial book. The glans itself may widen and lengthen as the stimulation continues, becoming slightly darker in colour, while the gliding action of the foreskin reduces friction.