A new report from the CDC estimates that 22 percent of babies today—or about one in four—are born to unmarried parents who live together.

That’s almost double the rate in 2002!

The reason for the increase? Well, experts aren’t really sure, but women’s increasing economic independence may be part of it.

What we do know: Being in a supportive and healthy partnership is good for your stress levels and your general health—married or not.

But from there, it seems the beauty is in the details—which are unique to you!

MORE: Cohabitating Couples Happier Than Married