When you start to know someone, all their physical characteristics start to disappear. You begin to dwell in their energy, recognize the scent of their skin. You see only the essence of the person, not the shell. That's why you can't lust fall in love with beauty. You can after it, be infatuated by it; want to own it. You can not your heart. And that's why, when you really connect with a person's inner self, and physical imperfections disappear, become irrelevant.