When you start to know someone,their physical appearance start to disappear. You begin to dwell on 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 fall in love with beauty. You can lust after it, be infatuated by it, want to own it. You can love it by your eyes and your body but not your heart. And that's why , when you really connect with a person's inner self,any physical imperfections disappear, becomes irrelevant.
Back there, I'm doubting how can an ugly girl can be attached to a very smart good-looking boy. Experienced do taught me a lot. Now, I can smiled back to 'em, because I do know, there's must something special on him/her that could attract one to fall for 'em.