Crush pornography features objects being crushed by an actress or actor, who generally plays an overtly dominant role. Some people masturbate by using machines that simulate intercourse. The term comes from the French voyeur, one who looks. In POV porn, the shooting style is generally similar to gonzo pornography, with the person receiving sexual gratification holding the camera him or herself—aiming it down at the actress or actor who is performing the sex act. Sadomasochism refers to the aspects of BDSM surrounding the exchange of physical or emotional pain. Many transgender lesbian hentai people regard the term shemale as offensive, arguing that it mocks or shows a lack of respect towards the gender identity and gender expression of transgender individuals; in this view, the term emphasizes the biological sex of a person and neglects their gender. 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 seen in conventional porn and cinema. Unlike the usual power neutral relationships and play styles commonly followed by couples, activities and relationships within a BDSM milf xxx context are often characterized by the participants taking on complementary, but unequal roles; thus, the idea of informed consent of both the partners becomes essential. Swinging can take place in various contexts, ranging from a spontaneous sexual activity at an informal gay twinks social gathering of friends to a regular social gathering in a sex club or residence. Being forced to wear diapers as a form of humiliation is sometimes a behavior encountered in sexual masochism. Others consider the position to involve the man squatting over his reclined partner while the testicles are repeatedly raised and lowered into the mouth. 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.