Performers are usually clean-shaven, thinner and more effeminate than ones in mainstream gay pornography. Mutual masturbation can be practiced by males or females in pairs or groups with or without actually touching another person as indicated by the following examples of contact versus non-contact scenarios: Non-contact mutual masturbation Two people masturbating in the presence of each other but not touching. Actual upskirt or downblouse shots may violate privacy laws in some countries. For much of the history of cinema and television, lesbianism was considered taboo, though since the 1960s it has increasingly become a genre in its own right. The concept of lesbian, lesbian milfs to differentiate women with a shared sexual orientation, is a 20th-century construct. The smotherbox is placed on a stable surface. These scenes may involve the female actor calling for the shot to be directed at some specific part of her body. A crush fetish is a fetish in which one is sexually aroused usually when someone crushes objects, food, and sometimes small animals with their body, usually under their foot, or when crushed oneself. The term hentai is never 3d hentai used in this context in Japanese. This industry employs thousands of performers along with support and production staff. The name of the practice, when it is done in a repeated in-and-out motion, is derived from its passing resemblance to the dipping of a tea bag into a cup of hot water as a method of brewing tea. Lesbian pornography made for women is usually made by women, and usually features women who identify as lesbian gay twinks or bisexual. Clothes wetting: The person is sexually aroused by wetting one clothing or observing another person doing so. Some BDSM practitioners prefer a code of behavior that differs from SSC and is described as risk aware consensual kink , indicating a preference for a style in which the individual responsibility of the involved parties is emphasized more strongly, with each participant being responsible for his or her own well-being.