With the high-profile splits of so many Hollywood marriages, a couple such as actors Goldie Hawn and Kurt Russell are a marvel for staying together for 33 years.
Their secret to successful romance, according to Hawn, is that they never got married. She says, otherwise they "would have been long divorced." She said on Britain's ITV this week not getting married "gives you the freedom to make decisions one way or the other."
While tons of social research says marriage equates to greater health and happiness, there is not a lot of research on long-term cohabiting. What are your experiences of common-law relationships?
With files from the Associated Press.
Stephanie Coontz, Director of public education, Council on Contemporary Families, Author, "Marriage, a History: How Love Conquered Marriage."