An old man goes to the doctor asking for a prescription for the strongest dose of Viagra, explaining that he has two extremely insatiable young girls spending the weekend with him.
He happily toddles off with his prescription.
Later that week though, he returns to the doctor asking for painkillers.
The doctor asks `Why, are you in pain after all that sex?'
`No', says the geriatric lover-man, `it's for my wrists - the girls never showed up!'