Cartoon pornography is the portrayal of illustrated or animated fictional characters in erotic or sexual situations. Biological anthropologist Helen B. It is also referred to as anal–oral contact and anal–oral sex, or colloquially as rimming or a rim job, and may be performed by or on people of any sexual orientation for personal pleasure or as a form of erotic humiliation. This genre also features male-on-male fellatio through a small hole made in a bathroom divider. By comparison, gonzo pornography puts the camera right into the action, often with one or more of the participants both filming and performing sexual acts, without the usual separation between camera and performers videos porno gay seen in conventional porn and cinema. The Girls Gone Wild series is one example. No causal relationship is known between masturbation and any form of mental or physical disorder. In the West, masturbation in private or with a partner is generally considered a normal and healthy part of sexual enjoyment. Reading or viewing pornography, sexual fantasy or other erotic stimuli may lead to a desire for sexual release such as by masturbation. Female masturbation involves the stroking or rubbing of a woman vulva, especially her clitoris, with an naked milf index or middle fingers, or both. A study of the condom usage habits of New Zealand sex workers said that they offered various safe sex alternatives to vaginal sex to clients who refused to wear a condom. In the gay pornography industry, which uses amateurs anime hentai as well as professional actors, the term gay-for-pay refers to actors labeled or believed to be straight but who engage in same-sex sexual activities for money. For a foot fetishist, points of attraction include the shape and size of the foot and toes , jewelry , treatments , state of dress , odor, and sensory interaction . Sadomasochism refers to the aspects of BDSM surrounding the exchange of physical or emotional pain. 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.