Cheerleader pornography involves pictures of cheerleaders, both staged and real. Sadomasochism refers to the aspects of BDSM surrounding the exchange of physical or emotional pain. The preference could be barefoot, high-heels, flip flops, and so on, depending on the fetishist. Some are aroused from wetting their diapers, others like messing their diapers. Anilingus is an oral and anal sex act where one person stimulates the anus of another person by the use of their mouth, including lips, tongue or teeth. In the Diagnostic and Statistical Manual of Mental Disorders , published by the American Psychiatric Association, it is classified under 302.89 – Paraphilia NOS and has no diagnostic criteria other than a general statement about paraphilias that says the diagnosis is made if the behavior, sexual urges, or fantasies cause clinically significant distress or impairment in social, occupational, or other important areas of functioning. Bra pornography involves women momsex or men dressed in bras. Sadism describes sexual pleasure derived gaysex by inflicting pain, degradation, humiliation on another person or causing another person to suffer. Cum shots typically do not appear in girl-girl scenes and orgasm is normally implied by utterances, cinematic conventions, or body movement. The term breast fetishism is also used to refer to cultural attention to female breasts and the sexuality they represent, with debate continuing as to whether the modern widespread fascination with breasts among heterosexual hentai porn males in western societies is a sexual fetish. Nevertheless, it is only an attempt at phenomenological differentiation. Voyeurism is the sexual interest in or practice of spying on people engaged in intimate behaviors, such as undressing, sexual activity, or other actions usually considered to be of a private nature. Threesome or 3some pornography features one man and two women . The Girls Gone Wild series is one example. The word shibari came into common use in the West at some point in the 1990s to describe the bondage art Kinbaku.