The study also found that participants reacted positively to a much wider range of figures than a control group, even rating emaciated figures higher. Common positions include lying on back or face down, sitting, squatting, kneeling or standing. They may regard it as an enhancing element of their sex lives or as their primary form of sexual activity. During anal sex, male pleasure can be particularly derived from the prostate, which can lead to an orgasm and ejaculation. 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. In the 18th and 19th centuries, some European theologians and physicians described it gay hentai as heinous, deplorable, momporn and hideous, but during the 20th century, these taboos videos porno gay generally declined. 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 it. Point of view pornography is adult entertainment filmed to look as if the watcher were experiencing the sex act themselves. Some pornographic films use an artificial semen substitute to simulate or enhance creampie shots. Many transgender people regard the term shemale as offensive, arguing that it mocks or shows a lack of respect towards the gender identity and gender expression of transgender individuals; in this view, the term emphasizes the biological sex of a person and neglects their gender. Rimjob pornography centers around anilingus. Those with diaper-related paraphilias differ widely in their focus of attention. Today, pornographic films can be sold or rented on DVD, shown through Internet and special channels and pay-per-view on cable and satellite, and in adult theaters. Boots are seen as the perhaps most fetishistic of all footwear and boots may be the most popular fetish clothing attire. Portrayals of lesbians in the media suggest that society at large has been simultaneously intrigued and threatened by women who challenge feminine gender roles, and fascinated and appalled with women who are romantically involved with other women.