In a separate article analyzing 12 men who engaged in bestiality, an additional analysis of an 11-man subgroup revealed that 6 had engaged in coprophilic behavior, compared with only 1 in the matched control group consisting of 12 SM-oriented males who did not engage in bestiality. As amateurs in a single segment of a multi-part video, the actresses are typically hentai videos paid only about 50,000 yen . Spanking or whipping pornography involves spanking or whipping, generally of the buttocks, with the hand or with other objects such as belts, switches, paddles, brushes, or whips. It can also be heightened by the person saying that they have to urinate. Enema pornography involves adults given enemas to others, often fake. Pleasure for the giver during anilingus gaysex is usually based more on the principle of the act. This type of stimulation is typically all that is required to achieve orgasm and ejaculation. Hamedori-type videos were produced from the beginnings of Japanese AV in the early 1980s. Pegging is a recently invented word which features a woman penetrating a man with a strap-on dildo. Pornographic films are generally classified into sub-genres which describe the sexual fantasy which the film and actors attempt to create. As with most forms of sexual activity, anal sex participants momsex risk contracting sexually transmitted infections . BDSM has become an umbrella term for certain kinds of erotic behavior between consenting adults. Simultaneous penetration of the vagina and anus. Anal sex is considered a high-risk sexual practice because of the vulnerability of the anus and rectum. Lesbians may encounter distinct physical or mental health concerns arising from discrimination, prejudice, and minority stress. A smotherbox has two openings. High heel pornography involves women or men dressed in high heeled shoes. This is also the case in many relationships not considering themselves as sadomasochistic; it is considered to be a part of BDSM if it is practiced purposefully. Kinbaku is a Japanese style of bondage or BDSM which involves tying up the bottom using simple yet visually intricate patterns, usually with several pieces of thin rope .