Now There's a Reason for Her to Beer Me
If one married person is happy, the other tends to be. But that's not necessarily the case with couples that are merely shacking up. LINK. Excerpt:
“If she's happy, then he's happy--and vice versa. Married men and women are significantly more satisfied with their life when their spouse is also satisfied with life, according to new research from Britain's University of Warwick.
”But here's the really odd catch: This secret for happiness only works if you're married. The same level of satisfaction was not found in couples who live together without saying 'I do.'”