Preggo pornography features pregnant performers nude milfs and may include erotic lactation as a fetish. A survey by the New York City Department of Health and Mental Hygiene found that heterosexual women are more likely to bareback when engaging in anal sex than homosexual and bisexual men. 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 videos porno gay Taboo magazine. If one person is penetrated by two objects, it is generically called double penetration . Women who perform in lesbian pornography often do not consider themselves lesbian or bisexual. Older names for a pornographic film include stag film, and blue movie. Rape pornography features performers simulating rape. The reverse of this, in which nude women interact with clothed men, is called Clothed male, naked female . The term pearl necklace is used by some because the drops of semen deposited by the man resemble a necklace of translucent white pearls. 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. In some scenes or relationships it may be impossible for consent to be withdrawn in the gay hentai middle of a scene, or the bottom may have the ability to revoke consent for a relationship as a whole, but not for a particular scene. Creampie scenes depart from heterosexual pornographic convention in favor of a depiction that more closely mimics sexual intercourse as performed in ordinary life; they have been called the counterimage of facials. Commercialized pornography accounts for a nearly US0 billion worldwide industry for the production of various media and associated products and services. Tentacle erotica can be consensual, but frequently contains elements of non-consensual sex.