I've been an honorable man
You won't ever get to say that again without appending "Except for" if you do this. Even if it's just in your head. You'll get to stick your dick in a woman you aren't married to and lie to your wife about it and tell yourself all kinds of things to make it sound okay.
I only ever been with my wife too, but I don't think there's a pussy on this planet worth that. Maybe if one comes along and does a Gilbert & Sullivan routine and has Oktoberfest on tap I'll reassess but until then I am pretty sure they all do the same thing and are all attached to people. People willing to cheat, in this case.
If you want to hurt your wife, divorce her and be happy. This will just disgust and validate her.