Works in this genre may explore philosophical, political or social issues. In the Diagnostic and Statistical Manual of Mental Disorders , published by the American Psychiatric Association, it is classified under 302.89 – Paraphilia NOS and has no diagnostic criteria other than a general statement about paraphilias that says the diagnosis is made if the behavior, sexual urges, or fantasies cause clinically significant distress or impairment in social, occupational, or other important areas of functioning. However, various groups within society considered such depictions immoral, anime hentai labelling porn milf them pornographic, and attempting to have them suppressed under obscenity laws, with varying degrees of success. Studies have found that masturbation is frequent in humans of both sexes and all ages, although there is variation. Following World War II, during a period of social repression when governments actively persecuted homosexuals, women developed networks to socialize with and educate each other. The term has origins in the Greek language . The fantasy is typically based around one or more larger beings dominating a smaller being. In a few relationships, it leads as far as total submission of one partner in the truest sense of the phrase total power exchange . A pornographic work is characterized as hardcore if it has any hardcore content. In Japan, point of view pornography is referred to as hamedori . Particularly, some pornography in this genre features butch women, who are almost never gay fuck seen in mainstream pornography. 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. In contrast, a celebrity may take the route of openly releasing the tape and benefit directly from royalties as well as indirectly from the publicity. Cheerleader pornography involves pictures of cheerleaders, both staged and real. However, gay pornography in the modern world is mostly concentrated in the making of home videos , cable broadcast and emerging video on demand and wireless markets, as well as images and movies for viewing on the Internet.