“My wife has been acting strange lately, so I took her to the doctor.”
After running a series of tests, the doctor says, “I’ve narrowed it down to two possibilities: it’s either AIDS or Alzheimer’s.” I frantically ask, “How will we know which one she has?” The doctor replies, “Here’s what I want you to do—take her way out into the country and leave her there. If she finds her way back home… don’t have sex with her.”
Explanation: Don’t have sex with her.