Spanking can be administered in a number of spanking positions. Breast fetishism is a paraphilic sexual interest focused on female breasts . Today, religions vary in their views of masturbation; some view it as a spiritually detrimental practice, some see it as not spiritually detrimental, and others take a situational view. Some pornographic films use an artificial semen substitute to simulate or enhance creampie shots. Specific sex acts Anal Anal pornography features anal penetration with a penis, dildo, other objects, or some combination of them. These actors often play the top roles but this is not always the case, such as with Kristen Bjorn and some Bel Ami models. In S/M, the Sadist is usually the Top and the Masochist the Bottom, but these roles are frequently more complicated or jumbled . Use of the agreed safeword milf fuck is seen by some as an explicit withdrawal of consent. A bisexual threesome may involve a man having sex with a man and a woman, hentai movies the woman having sex with a man and a woman, or all three having sex with each other. Solo performances in gay pornography have been described in 1985 as either or both active and/or passive , whereas female solo performances are said to be exclusively passive . Some anthropologists and sociobiologists believe that breast fetishism derives from the breasts similarity to buttocks, but instead provide sexual attraction from the front of the body. 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. Coprophilia , also called scatophilia or scat , is the paraphilia involving sexual arousal and pleasure from feces. When the interest in a particular subject is obsessive, the behavior may be described as stalking. Commenting on why there are not as many female macrophiles, psychologist Helen Friedman theorized that because women in most societies already view men as dominant and powerful, there no need for them to fantasize about videos porno gay it.