The Boarder

An eighty-year-old man went to his doctor for a checkup. The man was getting married in a month to a girl 60 years his junior. The doctor tried to talk him out of the marriage, but it didn't work.
"If you want your marriage to last," the doctor conceded, "I say you at least take in a boarder." The old man agreed.
The old man didn't see the doctor until they met at a fund-raiser a year later. The old man says, "Doc, congratulate me, my wife is pregnant."
"That's good news," said the doctor. "I knew the boarder would help."
"Oh," said the old man with a wicked grin, "and the boarder's pregnant as well."

Muscle Contraction

Professor Higgins at the University of Sydney was giving a lecture on 'Involuntary Muscle Contraction' to the first year medical students.  This was not an exciting subject and the professor decided to lighten up the mood.  He pointed to a young woman in the front row and asked,  "Do you know what your asshole is doing while you're having an orgasm?"
She replied, "Probably golfing with his buddies."
It took 45 minutes to restore order in the classroom.

May September Marriage

A 90 year old man shows up for a physical. He tells the doctor he is about to marry a 20 year old girl. "Really?" said the doctor. "You're healthy enough, I suppose, but take my advice. If you want a happy marriage, you should take in a boarder. Do you know what I mean?" The old man says, "OK, doc. I'll think about it." Six months later, the doctor sees the old man on the street. He asks him how his new marriage is working out. "Great doc! In fact, my wife is pregnant." The doctor nods knowingly and says, "So you took my advice and took in a boarder?" The old man winked and said, "Yep. And she's pregnant too!"