I read a book where a couple gets married, and the husband made it clear they wouldn't live together. He said they'd avoid getting on each other's nerves, invading the other's space, and never have to worry about familiarity breeding contempt. After the usual misunderstandings and stuff that happens in novels, at the end they had their "happily ever after", but still lived in separate houses!
In real life, would this be a good idea?