A personal question here but, Are you circumcised? The reason I ask is because I was looking up circumcisions on the net(internal debat on if I am going to have my children circumcised) , and one side effect from circumcisions when they "snip" to much of the shaft is it pulls up hair that would normally be aroiound the base. Thus causing you to have a hairy shaft.
http://www.circumstitions.com/Restric/Botched7ex.html is a pic I found that might be helpful. Hope i could help!