I don't believe either statement has merit.

a) who cares really "doing black guys", seriously if she is with you who cares unless you are leaving the ladies a bit wanting at the end of the evening.

b) How is it obvious ? I have known "black" women that did not date "black" guys at all.


to answer: as with other posters, I believe it would have more to do with personality and compatibility than color. Further this is most likely true in regards to any "race".