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A Decade of Equality: The Ongoing Impact of Same-Sex Marriage

Marriage and the ability to start a family are fundamental human rights. On June 26, 2015, the U.S. Supreme Court’s landmark decision in Obergefell v. Hodges extended those rights to same-sex couples, affirming marriage equality nationwide.

Ten years later, the ruling continues to reshape lives—not only by granting legal recognition but also by opening access to the profound psychological, social, and health benefits that marriage can bring. With approximately 7.6% of Americans identifying as LGBTQ+, the ripple effects of this decision remain significant.

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The Proven Benefits of a Healthy Marriage

Decades of psychological research—largely focused on heterosexual couples—show that a healthy marriage enhances well-being in multiple ways. Married people tend to experience more positive emotions, report higher life satisfaction, and even enjoy better physical health outcomes, such as higher survival rates following cancer or major surgery.

Marriage also appears to benefit children, offering a more stable family structure that supports emotional and developmental health.

Importantly, these advantages go beyond those found in long-term cohabiting relationships. Even couples who live together often do not experience the same psychological boost that comes with marriage. Studies have shown that married partners report lower levels of depression and greater overall well-being than those in nonmarital relationships.

Of course, these benefits depend on marital quality. Happy, supportive marriages promote health and happiness; unhappy or conflict-laden ones can have the opposite effect, harming mental and physical well-being for both adults and children.

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Why Marriage Matters More Than Cohabitation

So, what makes marriage distinct? Why does it provide benefits that even stable, loving cohabiting relationships often do not?

One widely supported explanation is the concept of inertia, borrowed from physics. In relationship science, inertia refers to the idea that relationships naturally move forward along a predictable trajectory unless an external force alters their path.

As couples grow closer, they invest more—sharing time, money, homes, and social circles. Marriage represents a deliberate, intentional commitment in that trajectory—a conscious decision to unite lives long-term. Cohabitation, by contrast, often happens gradually or out of convenience, rather than as a clear commitment to permanence.

This sense of intention and stability may explain why marriage offers greater emotional and psychological rewards than cohabitation. Marriage isn’t just a label; it’s a statement of shared purpose.

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Same-Sex Marriage: Ten Years of Progress

Now that same-sex couples have had a decade of marriage equality, researchers are beginning to examine whether they experience the same benefits as heterosexual couples—and the early signs are promising.

A 2024 survey found that individuals in same-sex marriages reported feeling closer to their partners and more satisfied with life after marrying. Another study showed that married same-sex couples had greater psychological well-being than those in registered domestic partnerships. Similarly, research comparing same-sex cohabiting and married couples found that marriage was associated with greater happiness and fewer symptoms of depression.

As for children raised by same-sex parents, studies show they do just as well emotionally and developmentally as children of different-sex parents. However, there is still limited research on how children fare after same-sex parents divorce.