Throughout the millennia of human history, up until the past two decades or so, people took for granted that the differences between men and women were so obvious as to need no comment. They accepted the way things were. But our easy assumptions have been assailed and confused, we have lost our bearings in a fog of rhetoric about something called equality, so that I find myself in the uncomfortable position of having to belabor to educated people what was once perfectly obvious to the simplest peasant.