To me, it sounds like K's H is more immature and undeveloped in his sexuality and is avoidant of the whole thing.
You may be right but the thing that strikes me about Karen's husband is that he is mature, manly and non-avoidant in most other ways. Also, her description of their sexual interactions reminds me of my sister's description of her sexual interactions with a BF who later came out. Quite possibly I am way off base but it does happen that gay people try to repress their identities and marry straight people and it seems to me that it could happen that the straight spouse might end up on this BB.
"Tell me, what is it you plan to do with your one wild and precious life?" - Mary Oliver
