Why do kids have a super sonar that let's them know Mummy and Daddy are being a bit naughty together?? That they sense this and must MUST barge in on the poor Mummy and Daddy forcing them to lie to their sweet wee innocent faces with absurd things like "Oh! Well, uhm...your silly Daddy got his boxers stuck in his zipper and I was, uhm getting them unstuck with my teeth...Hey - go get some cookies downstairs! Do you want some cookies? Yeah - go on then, get out..."
We're getting a lock for the door.