That's what my littlest boy asked me this evening.

"Cupid hair?  I think you mean 'pubic' hair, babe" I said.

"Yeah, that.  What is it?"

"Well, when boys and girls get older and they stop being children and start being grown ups, they get hair in funky places.  Like their armpits, and their private places."

"WHAT???????  Does dad have that????"

"Yes, he does.  So do I."

"LALALALALALA NOT LISTENING!!! EEEEWWWW!!!!!   ICK!!!!!  NOOOOOOOOO!!!!"

And he runs off down the hallway.

So, that was my 'birds and bees' lesson for today.  Tomorrow morning I think we'll talk about breaking voices and periods.  That should ensure he'll stay away from me for the rest of the day.....