Fisher said that perhaps, the fleshy, rounded buttocks gay twinks attracted males during rear-entry intercourse. The other person may do the same during or after. These scenes may involve the female actor calling for the shot to be directed at some specific part of her body. Target audience are teenage / young adult women. Even though the performers who perform in these films typically appear on many reality websites within a short span of time, most of these websites claim that each of them is an amateur. Sadomasochism is practiced in isolation relatively rarely, though some masochists report biting, pinching, or even stun-gunning themselves as a prelude to, or as part of, masturbation. The object or situation of interest is called the fetish; the person who has a fetish for that object/situation is a fetishist. Depictions of male and female masturbation are common in pornography, including gay pornography. The current record is held by Lisa Sparks who had sex with 919 men on October 16, 2004 in Warsaw, Poland as part of the Third Annual World Gangbang Championship and Eroticon 2004. Hamedori is a genre of Japanese pornography in which a male adult video actor or director serves as the camera operator. This fetish sometimes originates from childhood memories of needing, or of seeing another needing, to urinate. It is suggested that much of the obscurity and the uncertainties about female ejaculation are related to mixing up these two phenomena. Diaper pornography involves performers wearing diapers, sometimes with an adult performer acting in the role of a caretaker. BDSM is a variety of mature milfs erotic practices involving dominance and submission, role-playing, restraint, and other interpersonal dynamics. Oral sex pornography frequently features a person performing fellatio, and less frequently cunnilingus. The definition clash also appears with the English definition of yuri as any lesbian relationship, as opposed to its sexually explicit gay hentai definition in Japan. Sexual relations between women have been illustrated as well as narrated, but much of the written material from the early modern period has been destroyed.