The use of the word creampie to describe such scenes originated in U. It is also known colloquially as gushing or squirting, although these are considered to be different phenomena in some research publications. Diaper fetishism, nappy fetishism or diaperism, is a sexual fetish in which a person feels a desire to wear or use diapers. 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. When the interest in a particular subject is obsessive, the behavior may be described as stalking. Real medical shots or videos may violate privacy laws in some countries. Reality and voyeur pornography, animated videos, and legally prohibited acts also influence the classification of pornography. Examples of mentally oriented practices are education games, during which lesbian milfs the dominant requires certain forms of behavior from the submissive. A survey by the New York City Department of Health and Mental Hygiene found that heterosexual women are more likely to bareback when engaging gay movies in anal sex than homosexual and bisexual men. Masturbation is the self-sexual hentai videos stimulation of the genitals for sexual arousal or other sexual pleasure, usually to the point of orgasm. Though there have been numerous gang bang pornographic films since the 1980s, they usually involved no more than half a dozen to a dozen men. Buttocks are sometimes emphasized in pornography, where they are often referred to as booty. While anal sex is commonly associated with male homosexuality, research shows that not all gay males engage in anal sex and that it is not uncommon in heterosexual relationships. If one person is penetrated by two objects, it is generically called double penetration . As a form of non-penetrative sex, it can be done for its own enjoyment or as foreplay. The name was coined from the title of the controversial book.