The Birds and the Bees

The teacher was telling the kids about the birds and the bees and she explained that when a man and a woman meet and fall in love, nine months later the stork usually brings them a little baby.
Little Johnny at the back of the class puts his hand up and asks the teacher, "are you sure about the stork miss? Cos my sister just got a little baby and she said it was from a shag at the beach.!!!"