If you can't pass up a good happy hour, you shouldn't date someone who never has more than one drink. That's the takeaway from a new study, which looked at how drinking habits affect marital bliss among older couples (married an average of 33 years). But the findings still apply to 20-somethings looking for happy long-term relationships.

Couples in the study were most unhappy when one spouse drank significantly more than the other. If they matched each other drink for drink, they tended to be happier. The good news? You don't have to like the same type of alcohol. It's more important that your drinking habits sync up. So if you hate missing a night out, you don't want a Sig O who loves spending nights at home watching Netflix—unless that's accompanied by a bottle of wine.

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