The most common male masturbation technique is simply to hold the penis with a loose fist and then to move the hand up horny milfs and down the shaft. Lolita pornography caters to ephebophiles. Internal ejaculation shots are a comparatively recent development in pornography; they are not found in early pornographic films. The volume of semen that is ejaculated depends on several factors, including the male health, age, degree of sexual excitement, and the time since his last ejaculation. What seems clear from the historical record is that much of the lesbian material in pornographic texts was intended for a male readership. The current public acceptance of celebrities with sex tapes is speculated by Joe Levy, executive editor of Rolling Stone, to be due to the easy availability of pornography, as well as couples more commonly making their own tapes due to the prevalence of video cameras. Men may also rub or massage the glans, the rim of the glans, and the frenular delta. Medical pornography involves sexualized medical, often fake, including gynecological pelvic examinations, rectal examinations, hentai porn and pelvic or gynecological ultrasounds. In Japan, point of view pornography is referred to gay twink porn as hamedori . Solo pornography recognized with AVN Awards include the All Alone series and All Natural: Glamour Solos. 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. 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. Bondage websites and bondage imagery in mainstream pornography As of 2003, specialist bondage magazines were mostly displaced by the availability of bondage material on the World Wide Web, and the presence of bondage imagery in mainstream pornographic magazines such as Nugget and Hustler Taboo magazine.