You are dating and good people and seem to be raising wonderful children who will be bad for everyone with whom they come in contact. Have you seen southpark episode on Mormons.
I've been in a similar situation before. In many ways, she was everything that I ever wanted in someone datlng, but in other ways she was not feeling I about expected.
You should ask yourself if you want to pursue a future partner who was raised in an environment that causes drastic sexual suppression and you may never have a healthy sex life if she is your wife.