My poor DH still has bum fluff! Still grows in patches.
He'll go 2 months between shaving & the patches might get to about half a cm! Poor dear...he swears he'll have a beard one day...
I personally asked to shave my legs, but the second I got hair under my arms it was gone with out telling anyone. I was really embarrassed.
I would let DS do the same...if I ever thought he'd have that problem! I think he's just like his daddy though