When we look at nature there's nearly always a reason for things, and it comes down to survival and reproduction. So this begs the question, how could a condition that makes men significantly uglier to the opposite sex with no apparent survival advantage exist? In prehistoric days humans started having children at a much younger age. The average life expectancy was 25-37 years, which coincidentally is also the age range when baldness kicks in. I believe baldness is nature's way of screaming at women "DO NOT BREED WITH HIM" since it implies a man is near the end of his life, and therefore wouldn't make a good provider and protector for her and her offspring.