Hmmm, I don't know about the wandering eye Force Guy... To me, that's almost subconscious for most... I think if it is a persistant PROBLEM then it's one thing, but I think that fidelity is mostly in your ability to control yourself more than anything... You are faithful because you care about the person, and you wouldn't do anything to hurt them like cheating... Your eyes may wander, but do you act? Procreation is a natural instinct, so wandering eyes will happen... Do you do it in your partner's face, do you do it often, or constantly? Or are you able to control yourself, and of course "keep it in your pants"? That's where it, to me at least, isn't infidelity...
To me, I can look at a good looking girl, admire whatever I'm admiring on her, but still not really feel as though I'm lusting for her... Because the end debate in my mind is that "I wouldn't do anything to her because I'm with my gf and care about her"... It's an interesting thought though, what you bring up, but I don't think I agree with the wandering eye syndrome unless it's blatant and constant, and is a "problem" between the people in the relationship. If that makes sense.