The eighty three year old lady finished her annual physical exam and the Doctor said, "You're in fine shape for your age, Mrs. Green, but tell me, do you still have intercourse?" 

"Just a minute, I'll have to ask my husband,” she said.
 
She stepped out into the crowded reception room and yelled out loud:  "Bob, do we still have that Intercourse?"

There was a complete hush and a few smirks.  

Bob answered impatiently, "Damn it Helen! If I told you once I've told you a hundred times...What we have is Blue Cross!"