Most bisexual porn is made by small production companies rather than the major studios. The act may be carried out face to face, or head to tail, with the woman recommended to be on top if she has smaller breasts. Those with diaper-related paraphilias differ widely in their focus of attention. The most common male masturbation technique is simply to hold the penis with a loose fist and then to move the hand up and down the shaft. There is, however, no third party camera work involved. However, various groups within society considered such depictions immoral, labelling them pornographic, and attempting to have them gay movies suppressed under obscenity laws, with varying degrees of success. Coprophilia , also called scatophilia or scat , is the paraphilia involving sexual arousal and pleasure from feces. Rainbow parties were covered on The Oprah Winfrey Show in 2003, and became the subject of a juvenile novel called Rainbow Party. The term is typically used by the cinematographer within the narrative framework of a pornographic film, and since the 1970s has become a leitmotif of the hardcore genre. Group sex pornography features at least two men and two women , usually more, who all perform sex acts on each other. For a foot fetishist, points of attraction include the shape and size of the foot lesbian hentai and toes , jewelry , treatments , state of dress , odor, and sensory interaction . Contrary to the other two types, B/D does not define the Tops and Bottoms itself, and is used to describe the general activities with either partner being the receiver and the giver. Evolutionary psychologists suggest that rounded buttocks may have evolved to be desirable trait because they provide a visual indication of the woman youth and fertility. The term pearl necklace is used by some because the drops of semen deposited by the man resemble a necklace of translucent white pearls. A scene where many women have sex with one big tit milf man is referred to as a reverse gang-bang. Typically featured are hitting, choking, name-calling and hair-pulling.