Allsorts
I think it's the lack of intimacy that matters not sex. Without that the relationship is a shell.
I have to disagree with you about the relationship being a shell without intimacy. Whilst it is certainly better for the relationship to have that side of things, you can have the most wonderful friendship with the person you are married to. It may not be ideal but, in the end, most of us end up with that as we become less able to be mobile, etc. Of course, if you don't have a great friendship within your relationship, the lack of intimacy/sex is probably a killer.