In POV porn, the shooting style is generally similar to gonzo pornography, with the person receiving sexual gratification holding the camera him or herself—aiming it down at the actress or actor who is performing the sex act. Cartoon pornography is the portrayal of illustrated or animated fictional characters in erotic or sexual situations. Reading or viewing pornography, hentai movies sexual fantasy or other erotic stimuli may lead to a desire for sexual release such as by masturbation. Mutual masturbation, mutual manual gay twink porn stimulation of the genitals between partners, can be a substitute for sexual penetration. Gonzo pornography is a style of pornographic film that attempts to place the viewer directly into the scene. Internationally, hentai is a catch-all term to describe a genre of anime and manga pornography. Some are aroused from wetting their diapers, others like messing their diapers. Hentai narrow Japanese usage and broad international usage are often incompatible. Nevertheless, it is only an attempt at phenomenological differentiation. The primary subjects of pornographic depictions are pornographic models, who pose for still photographs, and pornographic actors or porn stars, who perform in pornographic films. Locks may be used to emphasize the submissive position or the submissive hands may be fastened naked milf above his head to the box. 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. The two sets of people involved often meet either randomly or arrange to meet up beforehand over the Internet. These actors often play the top roles but this is not always the case, such as with Kristen Bjorn and some Bel Ami models. Being forced to wear diapers as a form of humiliation is sometimes a behavior encountered in sexual masochism. His most famous model was Bettie Page, who became the first celebrity of bondage film and photography. The term has origins in the Greek language .