The interaction between tops and bottoms—where physical or mental control of the bottom is surrendered to the top—is sometimes known as power exchange, whether in the context of an encounter or a relationship. Mutual masturbation is a sexual act where two or more people stimulate themselves or one another sexually, usually with the hands. Group sex can occur between people of all sexual orientations and genders. Some productions are noted for sophisticated and/or experimental storytelling and animation techniques. Some BDSM practitioners prefer a code of behavior that differs from SSC and is described as risk aware consensual kink , indicating a preference for a style in which the individual responsibility of the involved parties is emphasized more strongly, with each participant being responsible for his or her own well-being. The effect is to give the viewer the sense that they are experiencing the sex acts that they are watching, as opposed to simply watching others as a voyeur. This may relate to fetishes such as voyeurism or cuckolding. Facial cum shots are currently regularly portrayed in pornographic films and videos, often as a way to close a scene. Some actors who are actually gay or bisexual will be marketed as straight to appeal to the allure of the unattainable, because straight men are virgins to sex with other men, and as in most gay male settings, the young, the muscular, and the unfamiliar are more sought.. High heel pornography milf fuck involves women or men dressed in high heeled shoes. When sexual activity is centered on one of the threesome, then the activity may be described as lesbian hentai a gang bang of the person. It may involve sexual attraction to women who are pregnant or appear pregnant, attraction to lactation, or attraction to particular stages of pregnancy such as impregnation or childbirth. Hentai is the various forms of Japanese pornography, including H-manga, gaysex H-anime, and H-computer games. The principal characteristic of voyeurism is that the voyeur does not normally interact directly with the subject of his/her interest, who is often unaware of being observed.