Even though the performers who perform in these films typically appear on many reality websites within a short span of time, most of these websites claim that each of them is an amateur. A pornographic work is characterized as hardcore if it has any hardcore content, no matter how small. The concept of lesbian, to differentiate women with a shared sexual orientation, is a 20th-century construct. Jerk off instruction features a performer encouraging or instructing the viewer to masturbate, often culminating in a countdown at the end of which the viewer is invited to induce orgasm. The smotherbox is placed on a stable surface. It is also followed by dedicated industry publications and trade groups as well as the mainstream press, private organizations , government agencies, and political organizations. 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. The name is a reference to gonzo journalism, in which the reporter is part of the event taking place. The term applies to the depiction of the act rather than the act itself, and so does not include live exhibitions like sex shows and striptease. Diaper pornography involves performers wearing diapers, sometimes with an adult performer gay cock acting in the role of a caretaker. Women oriented pornography mature milfs is sometimes referred to as sex positive pornography. Pornography is often distinguished from erotica, which consists of the portrayal of sexuality with high-art aspirations, focusing also on feelings and emotions, while pornography involves the depiction of acts in a sensational manner, with the entire focus on the physical act, so as to arouse quick intense reactions. A sex party is a gathering at which anime hentai sexual activity takes place. For instance, Amateur Allure has a trademark shot where the sexually performing cameraman circles a handycam around the sexually performing model head. Participants who exert sexual control over their partners are known as dominants or tops while participants who take the passive, receiving, or obedient role are known as submissives or bottoms.