"Bio-fundamentalism is out."  If you mean biology means nothing because DNA changes, I think you're making a huge leap of logic, lol.  

Rather than tally that which makes men and women similar versus different, why don't you assess why there are two sexes - in nearly all living creatures - and why instead we were just not all made sexually identical.  The ancients recognized the importance of the distinction, placing the difference in the earliest passages of the Bible.