In Japanese, the term describes any type of perverse or bizarre sexual desire or act; it does not represent a genre of work. The genre presents itself as real couples having real sex. 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. They signal the presence of estrogen and the presence of sufficient fat stores for pregnancy and lactation. Medical pornography involves sexualized medical, often fake, including gynecological pelvic examinations, rectal hentai sex examinations, and pelvic or gynecological ultrasounds. Such video tapes are often released without the consent of their subjects, and could potentially damage celebrities careers. A threesome is also depicted with one woman and two men who all perform sex acts on each other . The slave is usually strictly forbidden from placing their lips directly on the body of the dominant so the practice routinely involves them receiving much of the spray all over their face, hair and body, however, another way of doing this that applies mostly to male dominants, is to place the mouth on the head of the penis and drink the urine as it is released. The queening stool is also related to a smotherbox, which also allows the person under the seat to be locked in place, restrained by the neck as in a set of stocks. Nubile refers to a young woman who is ready or suitable for marriage by virtue of her age or maturity. Pegging films include Strap It On , Babes Balling Boys , Strap Attack, Strap-on Sirenz, Strap-on Chicks, Boss Bitches , various gay cock movies produced by LEDA Studios, and San Francisco-based Men In Pain. Reading or viewing pornography, sexual fantasy or other erotic stimuli may lead to a desire for sexual big tit milf release such as by masturbation. The loose and direct camera work often includes tight shots of the genitalia, unlike some traditional porn.