In pornography, depictions of lesbian sex form a popular subgenre, directed toward a male heterosexual and female homosexual mature milfs audience. Others may also use vibrators and other sexual devices more commonly associated with female masturbation. It may be used as foreplay, or as an alternative to sexual penetration. For uncircumcised males, stimulation of the penis in this way comes from the pumping of the foreskin, in which the foreskin is held and slid up and down over the glans, which depending on foreskin length, is completely or partially covered and then uncovered in a rapid motion. The higher pay scale and profile within a production often leads to group scenes where a straight actor only tops. Fetish cuckolding can have a wide range of expression, hentai movies from pillow-talk fantasy between monogamous partners to extreme alternative lifestyles, depending on the couple. 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. By Japanese law, the genitals of actors and actresses must be censored and up the mid-1990 so was the depiction of pubic hair. 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. Bobbi S. However the genre remains a very small proportion of the pornographic DVD market; for example at porn retailer HotMovies. Bukkake videos are a relatively prevalent niche in contemporary pornographic films. It is also often mixed with other fetishes in practice, such as voyeurism, denial, etc. An orgy is a gathering where guests freely engage in open and unrestrained sexual activity or group sex; and a bunga bunga gay movies orgy is an orgy in which participants have sex underwater, such as in a swimming pool or a hot tub. This category also includes pornographic home movies. Various groups within society have considered depictions of a sexual nature immoral, labeling them pornographic, and attempting to have them suppressed under obscenity and other laws, with varying degrees of success.