I agree with iapr and stacycat. Either you are attracted to someone or not. It really is just that simple, and you should not have to explain your choice. If they are unhappy about your choice, it is their problem, not yours.
Take for example, two beautiful, dark skinned women from Hollywood, Halle Berry and Rosario Dawson (both, multi-ethnic). To me, Halle Berry is very attractive while Rosario is not. It is very subjective and I can't even explain why one is more attractive than the other. Sometimes generalizations are just that, Generalizations.
I am from India and my wife is an American (white). According to anthropological definition both are Caucasians, but I can tell you that if I go out there and say that I am a Caucasian people will laugh at me! So even definitions are sometimes useless to a society!!
Mr. XX