In these research publications, it is suggested that real female ejaculation is the release of a very scanty, thick, and whitish fluid from the female prostate, while the squirting or gushing shown frequently in pornography is a different phenomenon, the expulsion of clear and abundant fluid, which has been shown to be a diluted fluid from the urinary bladder. Milking pornography features lactating women being milked or milking themselves . These include gently sucking and tugging on the scrotum and use of lips to ensure minimal contact with their teeth. The term has origins in the Greek language . Reality and voyeur pornography, animated videos, and legally prohibited acts also influence the classification of pornography. This type of pornography is almost exclusively hentai, as true hermaphroditic humans are not fertile and are not usually found in nature. Unlike smothering, in facesitting the bottom partner is not deprived of air. Sadomasochism refers to the aspects of BDSM surrounding the exchange of physical or emotional pain. Women with women Main article: Lesbianism in erotica: Lesbianism in contemporary pornography Lesbian or girl-girl pornography features big tit milf women engaged in sex together, but is typically aimed at a male audience. Some aspects of the research community distinguish between female ejaculation and what is colloquially known as squirting or gushing. Hentai narrow Japanese usage and broad international usage are often incompatible. Following World War II, during a period of social repression when governments actively persecuted homosexuals, women developed networks to socialize with and educate each lesbian hentai other. Reading or viewing pornography, sexual fantasy or other erotic stimuli may lead to a desire for sexual release such as by masturbation. Nevertheless, it is only an attempt at phenomenological differentiation. Unlike the usual power neutral relationships and play styles commonly followed by couples, activities and relationships within a BDSM context are gay fuck often characterized by the participants taking on complementary, but unequal roles; thus, the idea of informed consent of both the partners becomes essential.