A 2009 study found that heterosexual male fat admirers preferred females that were clinically overweight and rated both overweight and obese women more positively than slighter individuals. Crush pornography features objects being crushed by an actress or actor, who generally plays an overtly dominant role. Matsuo started working in the genre in 1991, saying that this intimate technique was a natural way for him to shoot in order to show his feelings for the girl and to get her to open up about herself, to show her true emotions. Reading or viewing pornography, sexual fantasy or other erotic stimuli may lead to a desire for sexual release such as by masturbation. It is also referred to as anal–oral contact and anal–oral sex, or colloquially as rimming or a rim job, and may be performed by or on people of any sexual orientation for personal pleasure or as a form of erotic humiliation. Unlike milf xxx smothering, in facesitting the bottom partner is not deprived of air. See also Gay-for-pay. The most successful animated features produced in the United States primarily for adult audiences were directed by Ralph Bakshi, including Fritz the Cat, Heavy Traffic and Coonskin. Such grounds and even the definition of pornography have differed in various historical, cultural, and anime hentai national contexts. The introduction of the home video and Internet saw a boom in the worldwide porn industry that generates billions of dollars annually. Men with men Gay pornography is usually male homosexual pornography, acts depicted typically include anal or oral sex. Clothed female, naked male pornography features naked men and clothed women; typically, the women humiliate and abuse the men or perform fellatio and/or handjobs on the men. The neologism pegging was popularized when it became the winning entry in a contest in Dan Savage Savage Love sex advice column, held after an observation was made that there was no common name for the act. Gay gay sex video pornography is the representation of sexual activity between males.