I guess you could say we are having an open marriage in the sense that she says that I just need to do whatever I need to do to take care of my needs. I'd prefer a conventional marriage with exclusive sex, but that's out. And we both prefer it to divorce. So, yes, it's working a lot better than divorce.
I know a lot of people say you should divorce because then you could find someone with whom you could have a standard marriage with sex, and that is all kosher and moral. Easy to say when it's not your marriage of many decades, as if spouses are just interchangeable units.