Works in this genre may explore milf xxx philosophical, gay bear porn political or social issues. In these research publications, it is suggested that real female ejaculation is the release of a very scanty, thick, and whitish fluid from the female prostate, while the squirting or gushing shown frequently in pornography is a different phenomenon, the expulsion of clear and abundant fluid, which has been shown to be a diluted fluid from the urinary bladder. Bear features a combination of middle-aged, hairy or overweight males. Positions can also be chosen specifically for added effects such as increased humiliation, elevation and suspension. The industry generally refers to such films as adult films, which is part of adult entertainment. Specific sex acts Anal Anal pornography features anal penetration with a penis, dildo, other objects, or some combination of them. Shotacon : Similar to Lolicon, this genre involves prepubescent or under-aged boys between the ages 6–12. 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. To avoid soreness from this resulting friction, some may prefer to use a personal lubricant, masturbation cream or saliva during masturbation. Some people get sexual pleasure by inserting objects, such as urethral sounds, into the urethra , a practice known as urethral play or sounding. Breast fetishism is a paraphilic sexual interest focused on female breasts . 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. When the interest in a 3d hentai particular subject is obsessive, the behavior may be described as stalking. Preggo pornography features pregnant performers and may include erotic lactation as a fetish.