I think more and more people want to live alone. You can be a couple without being in each other's pockets. I don't see why you have to share the same bathroom.
Be able to live alone even if you don't want to and think you will never find it necessary.
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I absolutely relate to being alone in squalor trying to come up with something adequate. I relate to that and I've been known to crawl out of bed and drink out of a 2-liter bottle of Diet Coke.