There are currently no known laws forbidding the crushing of objects and insects, however the production or trade of crush erotica involving live vertebrates is condemned by animal rights activists and is illegal in many countries, including the United States and Great Britain. Cum swapping pornography involves performers trading semen between their mouths. Initially, few animation studios in the United States attempted to produce animation for adult audiences, but later examples of animation produced for adults would gain mainstream attention and success. It may involve gay boy porn sexual attraction to women who are pregnant or appear pregnant, attraction to lactation, or attraction to particular stages of pregnancy such as impregnation or childbirth. Men and women may masturbate until they are close to orgasm, stop for a while to reduce excitement, and then resume masturbating. Fat fetishism also incorporates stuffing and padding, whereas the focus of arousal is on the sensations and properties of a real or simulated gain. Cum-shot pornography features a collection milf fuck of male ejaculation scenes. Arguably the most famous example of the genre is the Taboo series. In places where non-monogamous sex is taboo or illegal, group sex may take place in private or clandestine locations including homes, hotel rooms, or private clubs. The term has as its origins Frantz Fanon epidermal schema and Edward Said Orientalism. Pornography can be classified according to the physical characteristics of the participants, fetish, sexual orientation, etc., as well as the types of sexual activity featured. Similar to Freud idea of a fetish, Bhabha defines racial fetish to be a fixation on other races being not different, but lesser or mutilated versions of the white male. Caro rejected that as being a hentai sex necessary conclusion, stating that female fatty deposits on the hips improve individual fitness of the female, regardless of sexual selection. This practice has a distinct effect of immobilization and pain.