The happiest couples — married or not — tend to share a key characteristic

There's nothing quite like wedding season to get you contemplating the next phase of your relationship. So you're probably wondering — let's just say theoretically — how might tying the knot affect my partner and I? Will it make us happier? Strengthen our relationship?

Aside from the enthusiastic friend or extended family member, you probably have loads of anecdotal evidence suggesting that the answers to both of those questions is yes. After all, thousands of Pinterest boards can't lie — or can they?

Interestingly, the bulk of sociological research on this topic actually suggests that it isn't marriage that's the key to lasting happiness, but something far more basic. It all comes down to finding a romantic partner who also happens to be the person you'd call your best friend.

In a recent study of thousands of couples on marriage and happiness, John Helliwell, a University of British Columbia economist and the co-author of the UN World Happiness Report, found evidence suggesting that the most important factor for a lasting, happy relationship was whether or not you see your romantic partner as your closest friend.

Helliwell and his research team looked at data from two large British surveys and the Gallup World Poll. After accounting for couples' age, gender, income, and health conditions, they found that couples who were best friends and lived together were just as happy as couples who were best friends and married.

In other words, marriage didn't appear to matter much at all.

Here's a chart from the study comparing the "life satisfaction" of couples who were married (blue bars) with couples who lived together but were unmarried (red bars). Couples who said their partner was their best friend are on the left.

Other research seems to support Helliwell's findings.

In a recent blog post for Psychology Today, social psychologist Bella DePaulo took a look at a large 2012 review of more than 20 studies of married and divorced couples. Initially, the researchers concluded that marriage made people happier. But taking a closer look at the numbers, DePaulo came to the opposite conclusion.

"Except for that initial short-lived honeymoon effect for life satisfaction," she writes, "getting married did not result in getting happier or more satisfied. In fact, for life satisfaction and relationship satisfaction, the trajectories over time headed in the less satisfied direction."

Other studies back up DePaulo's assertion: A 2011 review of the impact on happiness of major life events found that couples who got married generally felt less happy and less satisfied with their lives over time.

Helliwell prefers to look on the bright side of these findings.

"Maybe what is really important [in a relationship] is friendship, and to never forget that in the push and pull of daily life," he said.

The happiest couples — married or not — tend to share a key characteristic

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