Old man and young wife

An older Jewish gentleman marries a younger lady, and they are very much in love. However, no matter what the husband does sexually, the woman never reaches orgasm. They go to their rabbi for advice and he says
“Hire a good looking young man. While the two of you are making love, have the young man wave a towel over you. That will help her fantasize and orgasm”
They go home and follow the rabbi’s advice. They hire a handsome young man and he waves a towel over them as they make love. It doesn’t work. So they go back to the rabbi and he tells them, “Let’s try it reversed. Have the young man make love to your wife and you wave the towel over them.” So they go back home to follow the rabbi’s advice again.
The young man gets into bed with the wife and the old man waves the towel. The young man gets to work with great enthusiasm and the wife soon has an enormous, room shaking, screaming orgasm.
The husband smiles, looks at the young man and says to him triumphantly, “Schmuck, That’s the way you wave a towel!”