Exclusively, though? I freely concede that males hold the dominant position in most societies, but at least in this one, I keep hearing about the courts knocking down the doors of one "No ______s Allowed" organization after another. Is it right (or, in the long term, healthy) for any group to isolate themselves by excluding others? If so, I suppose we might as well get on with the business of dividing ourselves up into tidy little like-minded tribes.