Just as long as the woman knows that her husband does have better sex with men. I would hate to be in a long-term relationship with a guy who didn't have the best sex ever with me, but who instead stayed with me purely for emotional reasons ... unless sex wasn't a priority for me either.
On the other hand, if that were the case I'd probably feel it. I would feel that something was missing. And that can be a very sad thing, especially if there is no one I would prefer to have sex over my SO. Unreciprocated feelings can be heart-breaking.