What The...!!

A guy walks into a strip club and sees a really pretty girl right in front of him. He goes up to her and asks, "Hey, Honey, want to come home with me?" She says yes. They go back to his house that night and they have sex. Throughout this whole time he hasn't been able to see her properly. When she rolls into the moonlight, he caught a glimpse of her. "What, the...! What are you doing here?" He had just realised that he was in bed wth his mother-in-law!