We both entered into this relationship with a full understanding of our proclivities. I knew that he couldn't stand to see me with another man; he knew that I have the impulse control of flea. Marriage isn't about being perfect for each other, it's about making a commitment to make it work. This is how we make it work.
This is just like using StayFocusd or maxvisit; you know you don't have the willpower, so you use other means to keep yourself productive (or faithful, in this case.)