Works in this genre may explore philosophical, political or social issues. A facial is a term for the sexual activity in which a man ejaculates semen onto the face of one or more sexual partners. Studies have found that masturbation is frequent in humans of both sexes and all ages, although there is variation. Drama Hardcore showed this kind of film on its film. Behind the Green Door was one of the first pornographic films to feature sex between a white actress with a black actor . A person may be sexually penetrated multiple times simultaneously. These actors often play the top roles but this is not always the case, such as with Kristen Bjorn and some Bel gay boy porn Ami models. A spanking may be carried out with the use of a bare or gloved hand, or with any of a variety of implements, including a paddle, strap, hairbrush, feather duster or belt. Hentai narrow Japanese usage and broad international usage are often incompatible. Swinging can take place in various contexts, ranging from a spontaneous sexual activity at an informal social gathering of friends to a regular social gathering in a sex club or residence. 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 . Before the enforcement of the Hays Code, some cartoon shorts contained humor that was hentai movies aimed at adult audience members rather than children. The loose and direct camera work often includes tight shots of the genitalia, unlike some traditional porn. A milf fuck 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. Point of view pornography is adult entertainment filmed to look as if the watcher were experiencing the sex act themselves. Erotic spankings are commonly combined with other forms of sexual foreplay. Scat or brown pornography features defecation, manipulation of feces, or consumption of feces, in reality or fantasy; a well-known example is the 2 Girls 1 Cup video.