In POV porn, the shooting style is generally similar to gonzo pornography, with the person receiving sexual gratification holding the camera him or herself—aiming it down at the actress or actor who is performing the sex act. Interactive pornography, available in CD-ROM and DVD format, allows the viewer to select the particular acts performed at any one time, sometimes with the camera providing a first person view. Positions can also be chosen specifically for added effects such as increased humiliation, elevation and suspension. Cartoon pornography includes, but is not limited to, hentai and parody renditions of famous cartoons and comics. Some masturbate only using pressure applied to the clitoris without direct contact, for example by pressing the palm or ball of the hand against underwear or other clothing. The current 3d hentai public acceptance of celebrities with sex tapes is speculated by Joe Levy, executive editor of Rolling Stone, to be due to the easy availability of pornography, as well as couples more commonly making their own tapes due to the prevalence of video cameras. Barebacking usually refers to a conscious and deliberate choice momporn to forgo condoms. Reality and young gay porn voyeur pornography, animated videos, and legally prohibited acts also influence the classification of pornography. People may experience pleasure from anal sex by stimulation of the anal nerve endings, and orgasm may be achieved through anal penetration – by indirect stimulation of the prostate in men, indirect clitoral/G-spot stimulation in women, and associated sensory nerves . The two sets of people involved often meet either randomly or arrange to meet up beforehand over the Internet. Such documents have not been recognized as being legally binding, nor are they intended to be. Group sex most commonly takes place in a private sex party or semi-public swinger gathering, but may also take place at massage parlors or brothels or, in some jurisdictions, at purpose-built locations such as sex clubs.