A guy rings his doctor to ask for some advice about his wifes condition:

" Hey Doc I can't tell whether she has syphilis or Alzhiemers disease"

Doctor says " Well take her for a long drive into the country at night and leave her there"

Guy says " Well what the marry is that gonna do ?"

Doctor says " If she makes it back on her own don't shag it "

well, the same thing I've heard a million times before about AIDS substituting syphilis.