Moishe had been married 4 times. He was now approaching 80 years old and went to see his doctor. When he was shown in to see the doctor, he said, “Doctor, I have to let you know that I am soon to get married for a fifth time – to an 18 year old girl.”
His doctor replied, “This could be fatal, you know.”
Moishe replied, “Well, if she dies, then she dies.”

Two weeks later, Moishe again visits his doctor. “Doctor, I think I’m going impotent.”
His doctor says, “Oh, and when did you first notice this?”
Moishe replies, “Last night and again this morning.”