A husband and wife were having sex when their 7 year old son walks in on them. "What are you doing?" he asks. "Err, we`re making a cake" his mother replies. A couple of days later, the son walks up to his mother and asks "Mum, did you and dad make another cake in the living room?" Remembering that they did indeed `make a cake` earlier, the mother replies "Yes, yes we did. How did you know?" The son then remarks "Because I licked the icing off of the couch".
