An older gentleman goes to the doctor for a checkup. After examining him, the doctor says,
“Everything seems fine, but you should cut out the intimate relations for a bit. It could be dangerous at your age.”
The man looks confused and replies,
“But Doc, my wife is half my age! Are you telling me I can’t… you know?”
The doctor smiles and says,
“I didn’t say you can’t do it. I just said you should be careful. If she dies, people might think you did it on purpose!”