Because some gay men consider heterosexual men to be objects of fantasy, some gay porn producers have almost certainly described some actors as heterosexual to increase sales and publicity for their product. Many times a top actor will then be sought as a bottom and the debut mature milfs is often treated as a notable event or even its own release. Some intend to create situations where others can see their wet clothing. Testosterone discourages fat storage in these areas. In recent years, however, many celebrities have benefited from the publicity resulting from the release of a sex tape. Following the introduction of the Motion Picture Association of America film rating system, independent animation producers attempted to establish an alternative to mainstream animation. Studies among BDSM practitioners in the US have shown that about half of all gay movies men find the idea of bondage to be erotic; many women do as hentai videos well. Some may pursue fantasies that are concerned with the circumstances in which a subject may give birth, or to the conditions to which the pregnant subject may find themselves acting upon, such as approaches to mobility, sleeping, and dressing. It may occur more frequently in private situations, such as spontaneous sexual activity among three friends, or arranged in a community of like-minded swingers or planned as a once-only experience; and rarely in anonymous settings, such as at orgies or other sex parties. Female masturbation involves the stroking or rubbing of a woman vulva, especially her clitoris, with an index or middle fingers, or both. It therefore has the connotation of being wild, dangerous, and fun. Typically features adult, masculine men with varying degrees of muscle, body fat, and body hair, akin to beefcakes, or bears. Typically, fisting does not involve forcing the clenched fist into the vagina or rectum; this is a practice called punching. In a few relationships, it leads as far as total submission of one partner in the truest sense of the phrase total power exchange .