I grew a moustache because I'm too lazy to shave and unemployed... but umm.. yeah, confidence, I like that reason much better.
But I think you're on to something. My experience is limited but I have a friend who can't seem to grow any hair just above his chin and right below is lower lip, not even a modest soul-patch. During drunken, yet, revealing night, he admitted he was on the smaller side.
Any Frank Zappa groupies wanna chime in on this?