The birds and the bees
 

The elegant countess said to her husband one day, "Our son is growing up. It's time you had a talk with him about the birds and the bees."
"All right," said the Count and that afternoon he and his son went for a stroll along the river. There they sae some young girls washing clothes on the river bank.
"There," said the Count. "you see those girls?"
"Yes," his son replied
"You remember what we did with thim that time?"
The boy said he remembered.
"Well," said his father, "That's what the birds and the bees do"