Quote: I do believe that sex would bring our relationship to new heights that cannot be reached without it.
Tell this to your wife. Also tell her that you will never be completely happy in your relationship if she doesn't try to work with you towards improvement. Let her think about your honest statements. Hold on to yourself and stay calm if she reacts to these statements in a negative way.
Quote: I'm convinced that most spouses who walk away and have affairs at least perceive that a need is not being met. And I think, there but for the grace of God go I.
This is how nearly everyone on this board felt before they started doing the work necessary to see real change in their relationships. Read SSM and PM. Listen to the advice given on this board. You will quite possibly find success and even if you don't you won't regret trying because it will be a great opportunity for personal growth.
"Tell me, what is it you plan to do with your one wild and precious life?" - Mary Oliver