It is typically animated pornography, as the legal age to be featured in a pornographic film in Japan is 18. Many transgender people regard the term shemale as offensive, arguing that it mocks or shows a lack of respect towards the gender identity and gender expression of transgender individuals; in this view, the term emphasizes the biological sex of a person and neglects their gender. The term combines elements of the Freudian psychoanalytic fetish and the Marxist commodity fetish, and is used in the context of British, Spanish and French colonialism and imperialism and their aftereffects. The name was coined from the title of the controversial hentai porn book. New York photographer Irving Klaw nude milfs also published illustrated adventure/bondage serials by fetish artists Eric Stanton, Gene Bilbrew, Adolfo Ruiz and others. Threesome can also refer to a love triangle, a three-way romantic relationship. The term pearl necklace is used by some because the drops of semen deposited by the man resemble a necklace of translucent white pearls. However, various groups within society considered such depictions immoral, labelling them pornographic, and attempting to have them suppressed under obscenity laws, with varying degrees of success. 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. It is geared towards heterosexual men, who most typically define a threesome as such. Barebacking usually refers to a conscious and hot gay sex deliberate choice to forgo condoms. This type of pornography is almost exclusively hentai, as true hermaphroditic humans are not fertile and are not usually found in nature. 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. Examples of mentally oriented practices are education games, during which the dominant requires certain forms of behavior from the submissive.