Not to beat a dead horse...oh fuckit, let's beat the damn thing...
How "micro" do you think it should be? Take interracial for example. Would you narrow in a bit and go with black guys/white females? Interracial lesbians perhaps?
How about an interracial with 4 or 5 different cats? Would that be better?
(I'm only using IR as an example, although it is something I am considering).
I guess you could drill down too far, then again you could be too general....Any thoughts?