"Because society looks down upon it"...who is society? Never bothered, never will bother for 'society', its my life and I am of the opinion that mostly it doesnt exist (read in context) other than in our imaginations based on our own guilt feeling that we did something wrong.

Anyways, interracial relationships would not matter so far both individuals are mature enough to understand each other in and out and do not impose their beliefs etc etc onto the other.