Participants who exert sexual control over their partners are known as dominants or tops while participants who take the passive, receiving, or obedient role are known as submissives or bottoms. When used as an alternative to penile-vaginal penetration, the goal may be to preserve virginity or to prevent pregnancy. The industry generally refers to such films as adult films, which is part of adult entertainment. Arcane or occult pornography involves sexualized situations with an occult or magical tone or performers who costume themselves in keeping with the theme, for example, a male performer dressed as a wizard. Diaper fetishism, nappy fetishism or diaperism, is a sexual fetish in which a person feels a desire to wear or use diapers. 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. Both sexes sometimes apply lubricating substances to intensify momsex sensation. 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. When the interest in a particular subject is obsessive, the behavior may be described as stalking. Lolita pornography caters to ephebophiles. 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 gay twink porn of video cameras. Pussing: British expression for an activity involving a consenting couple where the male partner watches the woman urinate otherwise lesbian hentai undetected in a semi-public place, usually a toilet cubicle at a pub, hotel, restaurant, theatre/cinema, office, club etc. There are various subcultures under this umbrella term and distinct difference between these subcultures. 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.