Other fetish Bareback pornography features performers who lesbian milfs are not wearing condoms. Its primary goal is sexual arousal in its audience. Examples of mentally oriented practices are education games, during which the dominant requires certain forms of behavior from the submissive. In 1988, a sex gay movies tape caused significant damage to Rob Lowe career. Rape hentai sex pornography features performers simulating rape. Preggo pornography features pregnant performers and may include erotic lactation as a fetish. Rainbow parties were covered on The Oprah Winfrey Show in 2003, and became the subject of a juvenile novel called Rainbow Party. The genres of pornography are based on the type of activity featured and the category of participants, for example mateur pornography is a category of pornography that features models, actors or non-professionals performing without pay, or actors for whom this material is their only paid modeling work. Snowballing or snowdropping is the human sexual practice in which one person takes someone else semen into his or her mouth and then passes it to the mouth of the other, usually through kissing. Sometimes one or more fingers may be inserted into the vagina to stroke its frontal wall where the G-spot may be located. Buttocks are sometimes emphasized in pornography, where they are often referred to as booty. 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. For much of the history of cinema and television, lesbianism was considered taboo, though since the 1960s it has increasingly become a genre in its own right. It is also followed by dedicated industry publications and trade groups as well as the mainstream press, private organizations , government agencies, and political organizations. Additionally, the buttocks give an indication of the shape and size of the pelvis, which impacts reproductive capability.