Gonzo pornography is a style of pornographic film that attempts to place the viewer directly into the scene. As a form of non-penetrative sex, it can be done for its own hentai sex enjoyment or as foreplay. The study also found that participants reacted positively to a much wider range of figures than a control group, even rating emaciated figures higher. When used as an alternative to penile-vaginal penetration, the goal may be to preserve virginity or to prevent pregnancy. Studies among BDSM practitioners in the US have shown that about half of all men find the idea of bondage to be erotic; many women do as well. Some POV/gonzo porn sometimes nude milfs breaks the strict point-of-view convention. Some people get sexual pleasure by inserting objects, such as urethral sounds, into the urethra , a practice known as urethral play or sounding. Cartoon pornography depicts illustrated or animated fictional characters in erotic and sexual situations. A 2009 study found that heterosexual male fat admirers preferred females that were clinically overweight and rated both overweight and obese women more positively than slighter individuals. Positions can also be chosen specifically for added effects such as increased humiliation, elevation and suspension. Those with diaper-related paraphilias differ widely in their focus of attention. Standing up, a chair, the corner of an item of furniture, or even a washing machine can be used to stimulate the clitoris through the labia and clothing. In Japanese, the term describes any gay twinks type of perverse or bizarre sexual desire or act; it does not represent a genre of work. A related term used in the genre is the term cougar, which implies an older woman as predator. These actors often play the top roles but this is not always the case, such as with Kristen Bjorn and some Bel Ami models. Such documents have not been recognized as being legally binding, nor are they intended to be. Its gain in prominence has been attributed to its depiction in the film Pecker, which was released in 1998.