A married couple on the farm are visited by an alien couple. The alien couple asked the human couple if they would like to swap partners for sex.
They agree, the human woman and alien man are together. She says, "You have a small penis!"
The alien man replies, "pull my ears!"
So she pulls his ears and his penis becomes larger. She is astonished and has the best sex of her life.
When the human couple come back together, she asked him how was it.
He replies, "It was great, but my ears are just killing me!"