Sexless Marriage (when one partner is ill)

Anyone out there think that this is a good idea? Some people are just too ill to have sex and if they are married, obviously their mates suffer. What do you think? Are there solutions to this problem or is it such a hush-hush topic that nobody wants to discuss it. I'd sure like to know whether or not a long term sexless marriage exists and if it can be a happy one.

Thanks for considering my questions and feel free to anonymously respond, if that is your desire.