A college professor's going to bed with his wife. He's not that tired, so he's gonna stay awake and read while she goes to sleep.
So he's reading, and every once in a while he reaches over and tickles her on the fun spot... "Kitza kitza..."
She says, "Will you stop that! Will you stop reaching over here and teasing me like that?"
He says, "I'm not teasing you. I'm wetting my fingers so I can turn then page."
