Although interracial pornography theoretically can apply to depictions of sexual activity between performers of any different racial groups, the term is most commonly used for heterosexual sex acts between black and white performers. Some diaper wearers wear their diapers for limited amounts of time, while others prefer to wear them on a 24-hour, seven-day schedule. The term bareback is used less frequently in the heterosexual community. The surfacing of sex tapes has become so common that some are leaked as a marketing tool to advance or establish a media career. They may repeat this cycle multiple times. As observation is encouraged, voyeurism and exhibitionism are closely gay hentai associated with dogging. Some productions are noted for sophisticated and/or experimental gay twinks storytelling and animation techniques. With second wave feminism and growth of scholarship in women history and sexuality in the 20th century, the definition of lesbian broadened, sparking a debate about sexual desire as the major component to define what a lesbian porn milf is. Pornographic films or sex films are films that present sexually explicit subject matter for the purpose of sexual arousal and erotic satisfaction of the viewer. Technically this is a form of exhibitionism rather than group sex per se. The partition maintains anonymity. Contact mutual masturbation One person touching another person to masturbate. Non-contact group More than two people masturbating in the presence of each other in a group but not touching each other. Masturbation involves touching, pressing, rubbing or massaging a person genital area, either with the fingers or against an object such as a pillow; inserting fingers or an object into the anus ; and stimulating the penis or vulva with an electric vibrator, which may also be inserted into the vagina or anus. However, that term is usually applied to a male who observes somebody secretly and, generally, not in a public place. Solo pornography features performers masturbating. The films were financially successful, winning AVN Awards for the best selling pornographic films of their year; however the events were effectively un-officiated and the record breaking claims often misleading.