25yearsmlc, the only general thing I can think of is that a woman who's never had an O might have lost interest and hope in ever having it happen by age 50, when children, menopause, and all else has piled on top. If you've never had an O, I could understand the lack of interest in sex, and a lack of understanding that it could be important to anybody. It would seem that to her, when I have an O, it's just like a sneeze. She's even remarked about my O's, and I have to explain that it's because the physical feeling is so intense. I can tell it doesn't really register with her. To her it just seems like a weird kind of trance I go through, and she has no personal experience with it.
And since I've never had a sexual relationship, never mind a single encounter, where a woman has a mutual sexual response, my viewpoint is probably different too. Perhaps I really don't know what I'm missing. Perhaps if we'd had a mutually satisfying sexual relationship, at a frequency close to what I'd have preferred, then I would feel much more that I'm missing something and not wanting to tolerate the lack of it. Perhaps the SSM I have now is not all that different from the best we've had, compared to what it could have been, that is.
25yearsmlc, what would you have done if your husband had never reached an O, and assume you'd never seen a man do that? And everything else about the marriage was OK?