There was a little girl and her mother walking through the park one day and they saw two teenagers having intercourse on a bench. The little girl says, "Mummy, what are they doing?"
The mother hesitates, and then quickly replies, "Ummm, they are making cakes."
The next day they are at a zoo and the little girl sees two monkeys having intercourse. Again, she asks her mother what they are doing and her mother replies with the same response, "making cakes."
The next day the girl says to her mother, "Mummy, you and Daddy were making cakes in the lounge last night, weren't you?"
Shocked, the Mother says, "Yes. How did you know?"
She explains, "Because I licked the icing off of the sofa."