BDSM has become an umbrella term for certain kinds of erotic behavior between consenting adults. Interracial pornography typically employs ethnic and racial stereotypes in its depiction of performers and many of interracial pornographic films still include racial stereotypes, although the segregation of actors by race has diminished considerably. Watersports pornography features sexual activities involving urine, such as golden showers. Squirt gay hentai pornography involves gay cock women ejaculating. Bareback sex is physical sexual activity, especially sexual penetration, without the use of a condom. Arousal may be triggered by seeing the body movements or facial expressions of that person. While most tentacle erotica is animated, there are also a few live-action movies. POV pornography involves camera angles designed to provide the viewer a view similar to that seen by one of the participants, whose face is never shown. Guro or Gore is a genre of Japanese pornography involving blood, gore, disfiguration, violence, mutilation, urine, enemas, or feces. 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. A common way that these are depicted in a single scene is with one woman and two men performing together. Asian people or Asiatic people are people who descend from a portion of Asia population. There were also a very limited number of specialist fetish magazines which featured images of bondage, such as the famous Bizarre magazine published from 1946 to 1959 by the pioneering fetish photographer John Willie, and ENEG Exotique magazine, published 1956-1959. 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. Going back at least as far as the Christy twins in the 1970s, depictions of incest and particularly milf xxx incest between twins has been a feature of gay pornography.