Or the marriage is opened for him so they both sexually satisfied.Your wife is right, though, and she is offering you what she can. You don't want that, which is fair enough. I understand she is upset, but you two are mismatched and there is no solution. One of you is destined to be unhappy, whatever you decide.
Or divorce and she can continue without and he can find a woman that truely loves him and wants to sexually fulfill him.