There is a medical distinction. We've all heard about people having guts or balls, but do you really know the difference? In an effort to keep you informed, the definitions are listed below:
GUTS - Is arriving home late after a night out with the guys, being met by your wife with a broom, and having the guts to ask: 'Are you still cleaning, or are you flying off somewhere?'
BALLS - Is coming home late after a night out with the guys, smelling of perfume and beer, lipstick on your collar, slapping your wife on the butt and having the balls to say: 'You're next, Chubby.'