I don't have explicit references to the actual papers, but I do know they're out there. Based on this, we can simply deduce that skin color is a rather distinct difference when we're talking about interracial sexuality. In order for the sexual attraction to kick in, they need to have a whole lot of other similarities, or it just isn't going to work on a biological level. Inferring that, due to a low level of interracial relationships, white people are inherently racist, you are. well. being racist.