I'm of the opinion that if there's a reason mixed race relationships/children are rare, it has largely to do with cultural biases rather than genetics. Which would make for some fun rp, if people actually respond ICly in such a way.
"Song dogs barking at the break of dawn, lightning pushes the edges of a thunderstorm; and these streets, quiet as a sleeping army, send their battered dreams to heaven."
Hipparion Tribe (Sagolii)Â - Â Antimony Jhanhi's Wiki