A serious question (well semi-serious). DS1 is well into fiddling with his bits at the moment, in fact we've even had him grappling with them at the dinner table this week . All fine, no big deal, we're used to casually saying 'that's nice dear' when he proudly shouts 'look at my big fat willy!' etc. (we did lightly discourage it at dinnertime btw). He's very bright and curious, asks loads of questions and I try to always be straight and honest when I answer.
But what do you say about testicles? He just seems to have got interested in them and in the bath a few times now he's talked about having bones in there and saying how those bones move about when he prods them. At the moment I say a non-commital 'oh really?' but should I set him straight with a bit more ballbag info? If so how?