Every time when a man went on a business trip, his wife would cheat.
One day he made sure that infidelity was something that she wouldn't repeat.
Before going on one of his business trips, he painted her ass green.
This time when it came to cheating, she wasn't at all keen.
She committed adultery and that proves that she isn't a saint.
Now he keeps her faithful because he still has a lot of green paint.