A woman and her young daughter are at the zoo and the daughter happens to see some monkeys having sex. She asks her mum what they are doing, the Mum doesn't want to have to explain it to her so she just says "They are making a cake".
The next morning, the daughter tells her mum " I know you and daddy were making a cake in the living room last night"
The mum was shocked and said "How do you know that? Did you see us?"
The daughter says "No, but I licked the icing off the couch!"