Following World War II, during a period of social repression when governments actively persecuted gay boy porn homosexuals, women developed networks to socialize with and educate each other. In Japanese, the term describes any type of perverse or bizarre sexual desire or act; it does not represent a genre of work. Internationally, hentai is a catch-all term to describe a genre of anime and manga pornography. In humans, females generally have more round and voluptuous buttocks, caused by estrogen that encourages the body to store fat in the buttocks, hips, and thighs. A bisexual threesome porn milf may involve a man having sex with a man and a woman, the woman having sex with a man and a woman, or all three having sex with each other. Pussing: British expression for an activity involving a consenting couple where the male partner watches the woman urinate otherwise undetected in a semi-public place, usually a toilet cubicle at a pub, hotel, restaurant, theatre/cinema, office, club etc. 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. A related term used in the genre is the term cougar, which implies an older woman as predator. A scene hentai movies where many women have sex with one man is referred to as a reverse gang-bang. Bukkake pornography involves a performer, usually female, onto whom several men or women ejaculate, usually on the face. 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. As a form of non-penetrative sex, it can be done for its own enjoyment or as foreplay. In the 18th and 19th centuries, some European theologians and physicians described it as heinous, deplorable, and hideous, but during the 20th century, these taboos generally declined.