Sounds like you are close to something.... good stuff. Take bj's advice - make a move.
I hear you loud and clear on where you head is at. If you believe the Mars/Venus for FMO stuff at all - men seek something deeper - of significance - especially true in the bedroom too. When our spouses extinguish it - it can really mess with your head - at least it did (and still does) with mine.
But the way out of that is to look deep - say "Dammit, I'm a man, I can handle this...I am not ashamed of my desires toward my W and I am going to show her..."
So try testing the waters - build a fantasy for your W. Buy her some new PJ's, undies, whatever...tell her you want to see her in them...tonight. Take her on a fantasy trip X - you can do it. And see what happens....
Sven
Never sacrifice the great for the good. Sometimes the beauty of grace is that it makes life not fair.