Terminology for roles varies widely within the various BDSM subcultures. Hardcore pornography is pornography that depicts penetration or extreme fetish acts, or both. The original definition of dogging – and which is still a closely related activity – is spying on couples having sex in a car or other public place. Hamedori is a genre of Japanese pornography nude milfs in which a male adult video actor or director serves as the camera operator. Men may also rub or massage the glans, the rim of the glans, and the frenular delta. The smotherbox is placed on a stable surface. Examples include the Girls Gone Wild and Girls Who Like Girls Series. Specific sex acts Anal Anal pornography features anal penetration with a penis, dildo, other objects, or some combination of them. Solo pornography recognized with AVN Awards include the All Alone series and All Natural: Glamour Solos. Cuckolding can also be mixed with other non-monogamous relationship arrangements with which it has substantial overlap such as Swinging, wife-swapping, open relationships, and polyamory, etc. When the interest in a particular subject is obsessive, the behavior may be described as stalking. Internal ejaculation shots are a comparatively recent development in pornography; they are not found in early pornographic films. The arousal from being desperate comes from the sensation of having a full bladder. Sigmund Freud considered foot binding as a form of fetishism. Rainbow parties were covered on The Oprah Winfrey Show in 2003, and became the subject of a juvenile novel called Rainbow Party. Its primary goal is sexual arousal in its audience. In general, BDSM play is usually structured such that it is possible for the consenting partner to withdraw his or her consent during a scene; for example, by using a safeword that was agreed on in advance. Heterosexual bareback sex, as opposed to sex with condoms, not only poses an increased risk of STIs, gay cock but for pregnancy as well. Evolutionary hentai movies psychologists suggest that rounded buttocks may have evolved to be desirable trait because they provide a visual indication of the woman youth and fertility.