More recent ones from my son at 7ish...
Son: Mom, is there a bone in my pee-pee?
Me: (after catching my breath and the heart palpitations stop) No...why do you ask?
Son: Well, dad said you need bones to move your body parts. How come I can move my pee-pee if there is no bone in it?
Me: Let me think about this one for a minute...hmm....well, actually its muscles you need to move your parts. Your tongue is a big muscle and doesn't have any bones and you can move that all around, right? Your pee-pee is kinda the same way...you can move it because of the muscle
Son: Oh, ok
Me: Why didn't you ask your dad that question, anyway since you two both have the same kind of pee-pee?
Son: I did. But, he said to ask you, you're the doctor!
A couple of months after that, he asked:
Mom, did you become a doctor so you could look at naked people all day?
To which, I replied: No. But, sometimes I have to and I don't want to :rotfl:
He is sooo boy!!