By momporn 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 seen in conventional porn and cinema. Medical pornography involves sexualized medical, often fake, including gynecological pelvic examinations, rectal examinations, and pelvic or gynecological ultrasounds. Double penetration of the vagina, anus and mouth, can involve: Simultaneous penetration of the anus by two penises or other objects. Pornographic films are typically categorized as either softcore or hardcore pornography. In the gay pornography industry, which uses amateurs as well as professional actors, hot gay sex the term gay-for-pay refers to actors labeled or believed to be straight but who engage in same-sex sexual activities for money. Diaper fetishism, nappy fetishism or diaperism, is a sexual fetish in which a person feels a desire to wear or use diapers. The act may be carried out face to face, or head to tail, with the woman recommended to be on top if she has smaller breasts. 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. Group sex most commonly takes place in a private sex party or semi-public swinger gathering, but may also take place at massage parlors or brothels or, in some jurisdictions, at purpose-built locations such as sex clubs. Breast fetishism is a paraphilic sexual interest focused on female 3d hentai breasts . Gay pornography is the representation of sexual activity between males. 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 two sets of people involved often meet either randomly or arrange to meet up beforehand over the Internet. Being forced to wear diapers as a form of humiliation is sometimes a behavior encountered in sexual masochism.