My next-door neighbor (at home) sorta had the same thing going...it was his third marriage, her first. Prior to marriage, they'd go back and forth the between his house and hers (about half an hour away), but were far from joined at the hip. After they got married, they did the same thing. Unfortunately, it didn't work out - she became quite the workaholic, eventually gave him permission to see other women, and they divorced this past year.