Originally Posted by lock

I cannot see why it is offensive but nor do i think black or white coffee should offend anyone either but it does.

I don't feel it is an awful domain i just doubt anyone would type in those two words to ever find it.I see it as a brand able and only good if you have blondetube brunettetube and asiantube to go with it if the keywords were so desired they would be bought both ways so tubenegro.com wouldn't be available.
If keywords were really sorted then hyphens would also be taken tube-negro.com negro-tube.com but if you going to market a brand able you need to sew up the rest of the market at same time before prices can be raised.