Screwing the Goat

Salesman to boy answering the door....... "Hi, is your mother in?"

"Yes, said the boy, she's out in the back yard screwing the goat." I don't believe it," said the salesman.

The boy says: "come and see for yourself."

So the salesman looked in the back yard, and sure enough, there was the goat screwing the mother. The salesman said to the boy, "Isn't she afraid she'll get pregnant?"

The boy says..N.-a-a-a-a-a-a-"