ssmguy I have been reading your posts and I salute you.
I too have found myself to be in a similar situation (but roles reversed). Great marriage, I'm really happy and love the guy. But the sex . . . still absent and, I fear, will always be an issue between us. I don't feel dumping the spouse for another is an answer. Yet I'm not sure how to survive the next 30 years.
You cannot make your wife "Seek to explore her inner self". All you can do is provide a supportive atmosphere, open the door and hope that she will walk through it.
Your a sexless female. Have you done all the equivilents to the Athol Kay MAP in the female equivilent?
In a previous situation my relationship partner and I were sexless, because I was doing that with someone else. That's the real reason. I didn't want to let this person go, counted on them for some mental support knowing they were there, but that's why we didn't sleep together.
I don't really like to get in the middle of marriages and believe people should do the best they can, single isn't always the best things, a marriage where both people respect and support and love each other is a beautiful thing.
The question you ask yourself, is looking up at 70 years old, do you still want to be sexless. Would you be happy with yourself knowing this was a choice you essentially made by continuing on with the situation?