As of 2013, little analysis of this paraphilia has been reported in medical literature. Homi Bhabha defined the idea of a racial fetish in contrast to the idea of the Freudian sexual fetish which he describes a denial of difference, where the male sees the female as a castrated male, seeing missing parts rather than a different anatomy. Depictions of male and female masturbation are common in pornography, including gay pornography. Some restrict a policy of panties/nipple tape for females lesbian hentai and some allow full nudity with explicit sexual interaction allowed. But starting with The World Biggest Gangbang , starring Annabel Chong, the pornographic industry began producing a series of films ostensibly setting gangbang records for most consecutive sex acts by one person in a short period. Often, strong views are expressed with regard to anal sex; it is controversial in various cultures, especially with regard to religion, commonly due to prohibitions against anal sex among gay men or teachings about the procreative purpose of sexual activity. Mammary intercourse is said by Alex Comfort to produce mutual orgasm in women with sensitive breasts , and it was one of the nine substitute exercises for penetrative sexual activities, as detailed in the Paradis Charnels of 1903. Unlike erotic films, pornographic films contain explicit sexuality and do not claim any artistic merit. BDSM is a variety of erotic practices involving dominance and submission, role-playing, restraint, and other interpersonal dynamics. The term hentai is never used in this context mature milfs in Japanese. The person sat upon may be in bondage, sexually submissive, or simply held down by the body-weight of the other person. Such explicit sexual interaction is seen only rarely in gay bear porn public play spaces, and it is sometimes specifically banned by the rules of a party or playspace. Klaw ran an international mail-order business out of his store, Movie Star News, selling cheesecake pinups and bondage/spanking photos. It is mutual consent that makes a clear legal and ethical distinction between BDSM and such crimes as sexual assault or domestic violence.