I'm thinking hubby knew the difference but just didn't want to hit his one kid limit and possibly get cut off. If at first you don't succeed try try again!
I've been saying that for years. You are the first person other than myself I've heard use that expression. I typically ask a question though...
"You know what they say about sex don't you?"
(Usually try to catch someone totally off guard with it after they have made a comment about something or other being a PITA. They always reply "No" with a dumbfounded look)
"If it's a pain in the ass you are doing it wrong!"
Then for affect you can just turn and walk away while they process it.