Why do a lot of guys think that, because their girlfriend recieves oral sex pre sex, that they are entitled to?

it as well. Think about it. Any person with half a brain would realize that a man's body is designed to cater to a women's body.: most women can't orgasm without clitoral stimulation and is in perfect position for licking. When a man recieves oral the exact same glands are being stimulated, so give me one logical reason for why some people look at them as if they are just equal. i'm not a she-women, man hating femininist. Just want some opinions :P