Another variant of reality pornography consists of normal couples that are filmed by professionals, in which case the only obvious distinction from amateur pornography is the higher quality of production, filming and editing. Interracial pornographic films have experienced an explosion in popularity, becoming one of the fastest-growing momporn and biggest-selling genres. For uncircumcised males, stimulation of the penis in this way comes from the pumping of the foreskin, in which the foreskin is held and hentai sex slid up and down over the glans, which depending on foreskin length, is completely or partially covered and then uncovered in a rapid motion. Since at least 1973, it has also been used to refer to a sexually attractive young gay boy porn woman. The original definition of dogging – and which is still a closely related activity – is spying on couples having sex in a car or other public place. Saliva pornography involves salivation and saliva. By Japanese law, the genitals of actors and actresses must be censored and up the mid-1990 so was the depiction of pubic hair. This category also includes pornographic home movies. For legal reasons, the vast majority of so-called reality porn involves professional actors and actresses posing as so-called amateurs. Films with risqué content commenced to be produced soon after the invention of the motion picture in the 1880s. Clothes wetting: The person is sexually aroused by wetting one clothing or observing another person doing so. Individuals are also sometimes abbreviated when referred to in writing, so a dominant person may be referred to as a Dom for a man, and a Domme for a woman. 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. Other possibilities are possible, such as a man having sex with two women who are having sex with each other.