John Stagliano is considered to have started the gonzo pornography genre with momporn his Buttm naked celebrities an series of films. Clothed male, naked female is one-sided female nudity in which one or more females are nude while one or more men are clothed. This type of pornography is almost exclusively hentai, as true hermaphroditic humans are not fertile and are not usually found in nature. When the interest in a particular subject is obsessive, the behavior may be described as stalking. Some aspects of the research community distinguish between female ejaculation and what is colloquially known as squirting or gushing. There is, however, no third party camera work involved. Since mammary intercourse is a non-penetrative sex act, the risk of passing a sexually transmitted infection that requires direct contact between the mucous membranes and pre-ejaculate or semen is greatly reduced. Yaoi is anime or manga that features gay males . Lolita pornography caters to ephebophiles. In the gay pornography industry, which uses amateurs as well as professional actors, the term gay-for-pay refers to actors labeled or believed to be straight but who engage in same-sex sexual activities for money. If dramatic skills are not involved, a performer in a porn film may also be called a model. Spanking can be administered in a number of spanking positions. Kurt Wild, who appeared as a bottom in Lucas Entertainment Gigolos, is married to a woman and has three children. 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. 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. There are various subcultures under this umbrella term and distinct difference between these subcultures. Lesbian pornography typically features a wider range of appearances and body 3d hentai types than is bareback gay porn typical videos porno gay of mainstream animated porn pornography.