Evolutionary Reason for Hair Loss?

I know this may sound ridiculous and maybe hypothetical, however i find it reasonable to ask. Hypothetically speaking, who ever the first person was on the planet to go bald, what scientific REASON did he? I know you may answer by saying they would have had DHT-sensitive cells,but that isnt really explaining what chemically or otherwise is making the follicles sensitive to DHT. People have DHT yet dont go bald, so what makes the cell sensitive to it? The usual answer i get given to why am bald is because the balding ‘Gene’ has been passed down. Well who ever was the first person to bald, What specific reason did his cells become sensitive to DHT?

This is a great question. For those readers who believe in evolution and not intelligent design, I gave one reasonable answer to why hair loss occurs in a previous post — Why Does the Back and Sides of the Head Not Lose Hair?

After having read Sex, Time and Power: How Women’s Sexuality Shaped Human Evolution by Leonard Shlain (referenced in the above link), I became a believer, as it was the only explanation for balding I’ve ever found.

The book is available at Amazon.com.