The two sets of people involved often meet either randomly or arrange to meet up beforehand over the Internet. In recent years, however, many celebrities have benefited from the publicity resulting from the release of a sex tape. 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, hentai movies such as at orgies or other sex parties. Some POV/gonzo videos porno gay porn sometimes breaks the strict point-of-view convention. The Girls Gone Wild series is one example. Biological anthropologist Helen B. Point of view pornography is adult entertainment filmed to look as if the watcher were experiencing the sex act themselves. The consensual submission of the submissive is sometimes demonstrated to others by symbols indicating his/her belonging to the dominant, such as wearing a collar, special tattoos, piercings, a very short haircut or a bald head. Instead, all five fingers are kept horny milfs straight and held as close together as possible , then slowly inserted into a well lubricated vagina or rectum. These styles are much closer to the style of bondage scenes in mainstream television. Sadomasochistic scenes sometimes reach a level that appear more extreme or cruel than other forms of BDSM—for example, when a masochist is brought to tears or is severely bruised—and is occasionally unwelcome at BDSM events or parties. People may experience pleasure from anal sex by stimulation of the anal nerve endings, and orgasm may be achieved through anal penetration – by indirect stimulation of the prostate in men, indirect clitoral/G-spot stimulation in women, and associated sensory nerves . Testosterone discourages fat storage in these areas. A spanking may be carried out with the use of a bare or gloved hand, or with any of a variety of implements, including a paddle, strap, hairbrush, feather duster or belt. No causal relationship is known between masturbation and any form of mental or physical disorder.