Masturbation is the self-sexual stimulation of the genitals for sexual arousal or other sexual pleasure, usually to the point of orgasm. Behind the Green Door was one of the first pornographic films to feature sex between a white actress with a black actor . Internationally, hentai is a catch-all term to describe a genre of anime and manga pornography. The two sets of people involved often meet either randomly or arrange to meet up beforehand lesbian milfs over the Internet. The act may be carried out face to face, or head to tail, with the woman recommended to be on gay sex video top if she has smaller breasts. It contains gay hentai graphic sexual activity and visible penetration. Typically features adult, masculine men with varying degrees of muscle, body fat, and body hair, akin to beefcakes, or bears. 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. Its gain in prominence has been attributed to its depiction in the film Pecker, which was released in 1998. As a form of non-penetrative sex, it can be done for its own enjoyment or as foreplay. Bondage pornography specializes in the depiction of sexual bondage or BDSM activities as photographs, stories, movies, or drawings. The term has also applied to other professions and even companies trying to appeal to a gay demographic. Arcane or occult pornography involves sexualized situations with an occult or magical tone or performers who costume themselves in keeping with the theme, for example, a male performer dressed as a wizard. Bear features a combination of middle-aged, hairy or overweight males. Women who perform in lesbian pornography often do not consider themselves lesbian or bisexual. 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.