Kind of a side note to the main thrust of the discussion, but I recently read an article about intersex persons. The term was first used to describe what used to be called "hermephroditic" individuals, or persons who displayed characteristics of both genders. Apparently they are discovering that more people than previously believed might be intersex because they are finding that there aren't always outward signifiers. There was a runner in the olympics who was nearly banned (I think they let her run, but not 100%) because her body produced abnormal levels of testosterone. It turns out there may be a whole spectrum of intersex individuals, many of whom may display no outward intersex characteristics.