A farmer married an attractive woman half his age. After several months on the farm, she complained that she had never climaxed during sex; and according to her Grandma, all farm wives are entitled to climax once in a while.
There being no doctor nearby, the farmer took his young wife to see a large-animal Vet.

The Vet didn’t have a clue, but he did recall how, during the hot summer, his Mum and Dad would fan a cow that was having any difficulty birthing a calf to cool her down and make her struggles easier. So,the Vet told them to hire a strong, virile, young man to wave a towel over them while they were having sex.This, the Vet said, would cause the young wife to climax.

So the couple hired a strong, healthy young man from the big city to wave a towel over them as the Vet suggested. After many efforts, still no climax. They went back to the Vet.

The Vet said for the two men to change places. The young man would have sex with the wife while the farmer waved the towel.
They tried it that night and she went into wild, ear-splitting climaxes, one after the other. When it was over, the farmer smugly looked down at the young city man and said,

“Ya see, city slicker,now THAT is how you wave a towel!”