I'm of 2 minds about this.
#1: if it's not shaved I'm not licking it. This rule goes 2 ways and I try to stay neat in return. I'm just saying the end of the shaft and maybe the balls, but if they're hair covered ,they're just not goin' in my mouth, sorry. scratchy, get stuck in teeth... just not a nice situation.
#2: a little hair goes a long way in making a man look... manly? I dunno, it seems appropriate, and I kinda miss having mine to run fingers in so I play w/ his instead.
That said, if you take a jaunt down to the advice forum, there's at least one thread on the topic, including techniques.
happy hunting!