I just think that men and women are self centered in different ways. Women, I think, tend to lean toward the emotionally self centered. Men, on the other hand, tend to lean toward the 'life goal' self-centered. In either case, well, everyone has an ego.
And when I say 'self centered', i think I mean that they tend to focus on those things in general, not just with themselves. You find women talking about other women's emotional issues, and men talking about other men's life goal issues. I don't think it's a matter of it being OK for either of them to be self centered over the other gender. We all have issues. That being said, I've dated and been married to and known many self centered men, and I've been friends with plenty of self centered women as well.