Diaper pornography involves performers wearing diapers, sometimes with an adult performer acting in the role of a caretaker. Target audience nude milfs are teenage / young adult women. John Stagliano is considered to have started the gonzo pornography genre with his Buttman series of films. Bestiality is illegal in many countries. Arcane or occult pornography involves sexualized situations with an occult or magical tone or performers who costume themselves in keeping with the theme, for example, a male performer dressed as a wizard. Oral sex pornography frequently features a person performing fellatio, and less frequently cunnilingus. 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. In the fetish cuckolding subculture, it is most common for the female to take on the sexually dominant role and the male the submissive role, however, female subs, sometimes referred to as cuckqueans, also exist. It is typically animated pornography, as the legal age to be featured in a pornographic film in Japan is 18. The term sadomasochism is derived from the words sadism and masochism . Double Stuffed , Double Vaginal , or Double Anal pornography involves the penetration of one orifice by two penises or other objects. Lying face down on a comfortable surface such as a mattress or pillow, the penis can be rubbed against it. On the other hand, the masochist enjoys being hurt, humiliated, or suffering within the consensual scenario. Both forms of pornography generally contains nudity. Additionally, the buttocks give an indication of the shape and size of the pelvis, which impacts reproductive capability. The name was coined from the title of the controversial hentai sex book. Rainbow parties were covered on The Oprah Winfrey Show in 2003, and became the subject of a juvenile novel called Rainbow Party. Spanking can be gay sex video administered in a number of spanking positions. While anal sex is commonly associated with male homosexuality, research shows that not all gay males engage in anal sex and that it is not uncommon in heterosexual relationships.