Spanking or whipping pornography involves spanking or whipping, generally of the buttocks, with the hand or with other objects such as belts, anime hentai switches, paddles, brushes, or whips. The anus has a relatively high concentration of nerve endings and can be an erogenous zone, and the receiver may receive pleasure from external anal stimulation. Pornography is often referred to as porn and a pornographic work as a porno. Others may also use vibrators and other sexual devices more commonly associated with female masturbation. There is also some evidence that pornography gay twinks can be used to treat voyeurism. Bareback sex is physical sexual activity, especially sexual penetration, without the use of a condom. Unlike the traditional definition of the term, in fetish usage a cuckold is complicit in their partner sexual infidelity and takes masochistic sexual pleasure in it. Sexual scenarios may involve male domination, female submission, exhibitionism and erotic entertainment. He talked to them extensively on camera so that both he and the viewer can come to know them before any sex scenes. By Japanese law, the genitals of actors and actresses must be censored and up the mid-1990 so was the depiction of pubic hair. Foot fetishism, foot partialism, foot worship, or podophilia is a pronounced sexual interest in feet. Each participant may engage in any type of sex acts with one or both of the others, such as vaginal, anal or oral sex or mutual masturbation. A facial is a form of non-penetrative sex, though it is generally performed after some other means of sexual stimulation, such as vaginal sex, anal sex, oral sex or masturbation. The 1979 U. The name of the practice, when it is done in a repeated in-and-out motion, is derived from its passing resemblance to the dipping of a tea bag into a cup of hot water as a method of brewing tea. The related term twinkle-toes, which implies that a man is effeminate, horny milfs tends to be used in a derogatory manner. However, the tradition of bondage magazines continues in the form of art books of bondage photographs, published by mainstream publishers such as Taschen.