Birds and bees (bit rude)

[rebbonk]

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 from its nest.

Little Johnny at the back of the class put his hand up and asks the teacher, are you sure about the stork, miss? I think you're getting your birds mixed up 'cos my big sister just got a little baby and

Spoiler:

she said it was from a shag at the beach!