Women who adopt a lesbian identity share experiences that form an outlook similar to an ethnic identity: as homosexuals, they are unified by the heterosexist discrimination and potential rejection they face from their families, friends, and others as a result of homophobia. Buttocks are sometimes emphasized in pornography, where they are often referred to as booty. Milking pornography features lactating women being milked or milking themselves . Instead, all five fingers are kept straight and held as close together as possible , then slowly inserted into a well lubricated vagina or rectum. Particularly, some pornography in this genre features butch women, who are almost never seen in mainstream milf fuck pornography. Before the enforcement of the Hays Code, some cartoon shorts contained humor that was aimed at adult audience members rather than children. To avoid soreness from this resulting friction, some may prefer to use a personal lubricant, masturbation lesbian hentai cream or saliva during masturbation. It may occur more frequently in private situations, such as spontaneous sexual activity among three friends, or arranged in a community of like-minded swingers or planned as a once-only experience; and rarely in anonymous settings, such as at orgies or other sex parties. As well as traditional attraction, the topic also incorporates feederism and gaining, where sexual gratification is obtained via the process of gaining gaysex body fat. Some people get sexual pleasure by inserting objects, such as urethral sounds, into the urethra , a practice known as urethral play or sounding. Patricia Hill Collins, an African-American writer, theorizes that this is derived from a stereotype that those of black descent are promiscuous, and their buttocks are objectified by porn as a result. Some masturbate only using pressure applied to the clitoris without direct contact, for example by pressing the palm or ball of the hand against underwear or other clothing. Some pornographic films use an artificial semen substitute to simulate or enhance creampie shots.