The only way I can really eat the yolks is if they are in an omelet and it's like a 1 egg: 4-5 white ratio...it's probably more of a psychological thing than physiological. Even as a kid I never ate them--when my dad would make us eggs for breakfast on Sunday mornings, I'd eat the white around the yolk. And I don't like eggs scrambled at all, even just whites.
I think eggs freak me out because when I was little, I was sleeping over at a friend's house, they had a farm and chickens, and her mom cracked an egg into a frying pan and the embryo was actually starting to develop...I couldn't eat eggs @ breakfast for about 6 years after that.