Are Similar Couples Happier?

There's a new study out on relationships, based on hundreds of lengthy questionnaires that people, mostly women, filled out online.

One of the findings is that people who say their mates are most like them are the happiest, which will probably end up in ads for eHarmony.

I think this is another case of getting the causality backward. I bet people who are happy in their marriages are more likely to say their spouses are like them, while those who are fighting are more likely to say that their spouses are different.