There was a little girl and her mother walking through the park one
day and they saw two teenagers having sex on a bench. The little girl
says “Mummy, what are they doing?”. The mother hesitates then quickly
replies “Ummm they are making cakes”. The next day they are at a zoo
and the little girl sees two monkies having sex. 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 eh?”.
Shocked, the Mother says “how do you know?”

She says, “Because I licked the icing off the sofa”.