The primary subjects of pornographic depictions are pornographic models, who pose for still photographs, and pornographic actors or porn stars, who perform in pornographic films. No causal relationship is known between masturbation and any form of mental or physical disorder. Whether or not licking and fondling is considered tea bagging was once debated on the Howard Stern Show. Those with diaper-related gay sex video paraphilias differ widely in their focus of attention. Diaper fetishism, nappy fetishism or diaperism, is a sexual fetish in which a person feels a desire to wear or use diapers. The two sets of people involved often meet either randomly or arrange to meet up beforehand over the Internet. Typically features adult, masculine men with varying degrees of muscle, body fat, and body hair, akin momsex to beefcakes, or bears. Top and dominant are widely recognized for those partner in the relationship or activity who are, respectively, hentai sex the physically active or controlling participants. Some aspects of the research community distinguish between female ejaculation and what is colloquially known as squirting or gushing. Female masturbation involves the stroking or rubbing of a woman vulva, especially her clitoris, with an index or middle fingers, or both. Cartoon pornography includes, but is not limited to, hentai and parody renditions of famous cartoons and comics. Instead, all five fingers are kept straight and held as close together as possible , then slowly inserted into a well lubricated vagina or rectum. In humans, females generally have more round and voluptuous buttocks, caused by estrogen that encourages the body to store fat in the buttocks, hips, and thighs. It is the most common form of sexual fetishism for otherwise non-sexual objects or body parts. Voyeur pornography may also include shots of topless women on topless beaches who are unaware of the cameras but may legally be photographed due to the public setting. Such works have also often been subject to censorship and other legal restraints to publication, display or possession.