The genre presents itself as real couples having real sex. Following the introduction of the Motion Picture Association of America film rating system, independent animation producers attempted to establish an alternative to mainstream animation. 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. In Japanese, the term describes any type of perverse or bizarre sexual desire or act; it does not represent a genre of work. A person may anime hentai be sexually penetrated multiple times simultaneously. Gay pornography is the representation of sexual activity between males. In some creampie films, both gay and straight, intercourse and internal ejaculation are followed by performers licking up the semen that has dripped from their bodies. Today, pornographic films can be sold or rented on DVD, shown through Internet and special channels and pay-per-view on cable and satellite, and in adult theaters. 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. Swinging can take place in various contexts, ranging from a spontaneous sexual activity at an informal social gathering of friends to a regular social gathering in a sex club or residence. A pornographic work is characterized as hardcore if it has any hardcore content. Men with Women, Women with Men Heterosexual or traditional gay sex video porn accounts for the majority of produced film and video content in the industry. Cheerleader pornography involves pictures of lesbian milfs cheerleaders, both staged and real. Reality pornography is a genre of pornography where staged scenes, usually shot in cinéma vérité fashion, set up and precede sexual encounters.