Fat man

A fat man with a beer belly and his wife decide to have sex. so they hop up onto the table and go at it, just then their 10 year old son walks in. "what are you and daddy doing" he asks his mother. camly his mother replies "im just trying to push your daddies belly button back in". The boy laughs and says "dont waste your time mummy the when you go shopping the next door neighbours wife just comes over gets on her knee's and blows it back up again!"