I'm sorry you're feeling lonely, it must hurt to feel rejected even though it's really nobody's fault.

We can quickly discard him by saying, "well, his tongue or fingers aren't broken."
But I feel like we should approach this sensitive topic with sympathy and understanding.
If I was an active man and suddenly lost my abilities, I would feel guilty and embarrassed and it would totally hurt my confidence and self-esteem (and these feelings of inadequacy will only worsen his performance; it's a vicious cycle), especially when they can't "fake" it at all...

Is he wanting to be physical, just can't do it?
- He should seek professional help. He isn't alone in this. It takes a lot of effort, time and money but it's worth his happiness.
- He can try viagra, or rings

Or has he lost all interest in sex / marriage?