'GUTS' is arriving home late after a night out with the guys, being assaulted by your wife with a broom, and having the guts to say,'are you still cleaning or are you flying 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 squarely on the *** and having the balls to say, 'You're next fatty!'
I hope this clears up any confusion