Along the primrose path of childhood children learn something fundamental. At a most basic level they incorporate that Dads and Moms are designations with very different implications. Up front, it is accepted that Dads are men and Moms are women; that Dads and Moms do different things at home and elsewhere. Simultaneously children learn that boys play rough and girls play nice and they usually like to do different things. Then kids learn that boys grow up to be Dads and girls grow up to be Moms.