I know this is old post but I felt a need to respond to this comment because you raised a question in my mind.

You said, “I think most people realize that a 1 would be having a partner who refuses sex, and a 5 is as good as it can get.”
Isn’t it completely possible that a refuser could define not having sex as a 5 , feeling highly satisfied without sex?
And that same person could rate having to provide unwanted and/or unpleasant sex acts for their partner as a 1?