Kinjiro you are the one that bought up racial differences initially, and you are right it doesn't have much to do with it - I used it as an example as it seems it was something you could relate too.
Taste and preferance is involved to a great degree. Taste and preferance determine what you find beautiful. And yes the same applies to food, but let's not complicate matters as the issue still stands.
Leaving the Burmese population out of it why do two guys from the same country find one of two women but not the same one beautiful.
Yes our taste and preferance determine what we find beautiful, but getting back to the original question - WHY?
If woman 'A' is beautiful to me; WHY do you think she's ugly?