Biological anthropologist Helen B. Pornographic films are typically categorized as either softcore or hardcore pornography. When the interest in a particular subject is obsessive, the behavior may be described as stalking. On May 27, 2010 the television program The Doctors discussed the topic with dozens of teens, parents, and professionals. Hardcore pornography gay sex video is pornography that hentai porn depicts penetration or extreme fetish acts, or both. Solo performances in gay pornography have been described in 1985 as either or both active and/or horny milfs passive , whereas female solo performances are said to be exclusively passive . 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. The warm sensation felt when urine trickles on the body seems to give very relaxing and pleasurable feelings to the person. They may regard it as an enhancing element of their sex lives or as their primary form of sexual activity. Crush pornography features objects being crushed by an actress or actor, who generally plays an overtly dominant role. 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. For a foot fetishist, points of attraction include the shape and size of the foot and toes , jewelry , treatments , state of dress , odor, and sensory interaction . They may be noted for using risqué themes, graphic violence, sexuality or black comedy in a manner that is unsuitable for younger audiences. The most common type of erotic spanking is administered on the bare buttocks, but can also be combined with bondage, in order to heighten sexual arousal and feelings of helplessness. A study of 164 males in Finland from two SM clubs found that 18.2% had engaged in coprophilia; 3% as a sadist, 6.1% as a masochist, and 9.1% as both. 18% of heterosexuals and 17% of homosexuals in the study pool had tried coprophilia, showing no statistically significant difference between heterosexuals and homosexuals.