God created person with perfect set of 23 XX chromosomes. First 4th of July:
Small explosion blew off one leg of one of the X's, thus .... one XY chromosome. Man still has deep-seated fascination with fireworks/pyrotechnics/flames/matches/charcoal /lighters/bbq's/straight gas/etc, all stemming from this original mishap.
God had to go back to drawing board and create Eve with perfect set of 23 XX chromosomes.
Happy 4th of July!