Ruth was complaining to her doctor at the annual checkup,
"I'm losing my urge to make love."
"Mrs. Edelman, it's quite natural and understandable. After all, you are eighty-four," said the doctor.
"But please tell me, when did you start to notice the change?"
"Last night," she answered, "and then again this morning."
"Aha!" exclaimed the physician.
"Your problem isn't a diminished sex drive. What you need is to be coupling at least fifteen times a month."
After thanking him, she headed home, eager to let her husband know her doctor's prescription.
"Guess what? He says I need it fifteen times a month, at least!"
Putting in his dentures her husband said,
"That's great, honey. Put me down for five."