I'm not recommending "threatening ultimatums," only that LDs have historically reported that even when their HD husbands brought up the sex topic repeatedly, they still somehow never "got it" until they conveyed a seriousness to it, and put a "I'm no longer willing to . . . " to it.
If there are legitimate medical reasons for his wife's LD, then she should communicate that to her husband as the reason she is unable to meet his needs right now, and she should get it checked out.
