Ouch... tell him you'll have a great story to tell when he brings a girl home to meet you ;-)
Heh heh!
I actually had to go lay down for a bit and collect my nerves.
I was changing Joshua's bandaid last night and told him he was gonna have a tattoo back there...you know how pencils leave a little black mark? I said "I won't say anything, I'll leave it to you to explain it to your wife when you grow up." Joshua said "I'm not going to explain it!" I said "Won't she wonder when she sees it?" Joshua said "Why would my wife be looking at my bottom?"
I just let it go at that.