For insights into healthy marriages, social scientists are looking in an unexpected place.

A growing body of evidence shows that same-sex couples have a great deal to teach everyone else about marriage and relationships. Most studies show surprisingly few differences between committed gay couples and committed straight couples, but the differences that do emerge have shed light on the kinds of conflicts that can endanger heterosexual relationships.

The findings offer hope that some of the most vexing problems are not necessarily entrenched in deep-rooted biological differences between men and women. And that, in turn, offers hope that the problems can be solved.

Next week, California will begin issuing marriage licenses to same-sex couples, reigniting the national debate over gay marriage. But relationship researchers say it also presents an opportunity to study the effects of marriage on the quality of all relationships.

“When I look at what’s happening in California, I think there’s a lot to be learned to explore how human beings relate to one another,” said Sondra E. Solomon, an associate professor of psychology at the University of Vermont. “How people care for each other, how they share responsibility, power and authority  those are the key issues in relationships.”