The fundamental principles for the exercise of BDSM require that it should be performed with the hot gay sex informed consent of all involved parties. Bukkake pornography usually depicts numerous men having sex with one woman, with multiple, usually 10 or more, men ejaculating on the female face. As with most forms of sexual activity, anal sex participants risk contracting sexually transmitted infections . 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. Arguably the most famous example of the genre is the Taboo series. In September 2003 the BBC reported on the new dogging craze. The terms can be complimentary or pejorative. Futanari, Hentai females with a penis. Fisting involves the insertion of one partner entire hand into a vagina or the anal cavity. High heel pornography involves women or men dressed in high heeled shoes. Masturbation has been depicted in art since prehistoric times and is mentioned and discussed in very early writings. In recent years, Japanese films of this genre have become more common in the USA and Europe although it still remains a small, fetish-oriented part of the adult film industry. This yields a view that would not be obtainable directly through the eyes of a person lesbian hentai while experiencing the sex act. An orgy is a gathering where guests freely engage in open and unrestrained sexual activity or group sex; and a bunga bunga orgy is an orgy in which participants have horny milfs sex underwater, such as in a swimming pool or a hot tub. The person sat upon may be in bondage, sexually submissive, or simply held down by the body-weight of the other person. Asian people or Asiatic people are people who descend from a portion of Asia population. Teacher and Student or Boss and Secretary pornography involves sexualized situations which take place between an authority figure, such as a teacher or boss, and an underling, such as a student or secretary, often fake. However, the tradition of bondage magazines continues in the form of art books of bondage photographs, published by mainstream publishers such as Taschen.