Single vs. Relationship Part 2: What the Research Really Says About Health, Money, and Happiness
In Part 1, we broke down the everyday, practical trade-offs of single life versus relationship life. This time, we are going deeper into what actual research says across the domains that matter most: mental health, physical health and longevity, money, social life, career, and sex. Some of the findings are exactly what you would expect. Others push back hard on the popular narrative in both directions.
What the Research Says About Mental Health
Life Satisfaction Is Not as One-Sided as Assumed
The old assumption that marriage is a straightforward upgrade to happiness has not held up well. Research on singlehood, including work by sociologist Elyakim Kislev, has documented rising life satisfaction among single adults over the past several decades, driven in part by reduced social stigma and stronger support networks outside of marriage. Happiness researchers now generally agree that relationship status alone is a weak predictor of wellbeing compared to the quality of a person’s overall social connection, whichever form that takes.
Quality Matters More Than Status
This shows up consistently across the literature: a good relationship correlates with strong mental health outcomes, but a bad one can be worse for wellbeing than being single. Status by itself is a much less reliable predictor than the actual quality of a person’s relationships, romantic or otherwise.
Physical Health and Longevity
The Marriage Survival Effect, and Its Fine Print
Large-scale meta-analyses do show a real effect here: married people, on average, have lower mortality rates than unmarried people, and the protective effect is strongest for men. But the fine print matters. Multiple meta-analyses have found that marital quality itself predicts survival better than marital status alone, and the protective effect of marriage is far more pronounced in people already dealing with a serious illness than it is in generally healthy populations. In other words, a good marriage helps most when you are already vulnerable. A mediocre or strained one offers much less benefit, and some research suggests real relationship strain can actively work against health.
How Singles Compensate
Single people are not defenseless against these effects. Larger single populations and normalized singlehood have expanded the social and support networks available outside of marriage, and researchers have pointed to this as one reason the health gap between married and never-married adults has narrowed in some populations over time.
The Financial Picture
The “Marriage Premium” in Earnings
One of the most replicated findings in labor economics is the marriage premium: married men earn meaningfully more than single men, with most studies putting the gap somewhere around 10 percent after controlling for other factors, and some studies finding considerably more. The honest caveat is that economists still debate why. The leading explanations are selection (higher earners are more likely to get and stay married), specialization (a partner handling more domestic responsibility frees up work capacity), and household search effects (married people can afford to hold out for better job offers). Notably, this premium is heavily skewed toward men. Single women, married women, and single men see far smaller and more mixed returns.
Cost of Living: Split Versus Solo
On pure day-to-day economics, sharing rent, utilities, and household costs with a partner is a real, tangible advantage. Single life carries none of that built-in cost-splitting, which is one of the more underrated financial trade-offs of living solo.
Social Life and Friendship Networks
The “Greedy Marriage” Effect
This is one of the more counterintuitive findings in relationship sociology. Researchers Naomi Gerstel and Natalia Sarkisian coined the term “greedy marriage” to describe a well-documented pattern: married couples consistently invest more of their time and attention into each other and less into friends, extended family, and neighbors, compared to single people. Across dozens of comparisons in their research, single people did more than anyone else to maintain outside relationships, married people did the least, and previously married people fell in between.
Why This Matters for Long-Term Wellbeing
A wide, active social network is one of the strongest predictors of long-term health and happiness, independent of relationship status. Singles who intentionally invest in that network are not settling for a consolation prize. They are building exactly the kind of broad support system the research consistently points to as protective.
Career and Productivity
Flexibility to Move, Pivot, and Take Risks
Without a second person’s job, lease, or preferences to coordinate around, single people generally have more freedom to relocate for opportunities, change careers, or take on demanding projects that require unpredictable hours.
The Trade-Off: Less Built-In Career Support
On the other side, the specialization effect behind part of the marriage premium is real: having a partner manage more of the domestic load can free up bandwidth for career-focused single-mindedness, an advantage single people have to build for themselves through other means, like outsourcing, routines, or a strong friend network.
Sex Life and Intimacy
Frequency Is Not the Same as Satisfaction
Partnered people generally report more frequent sex than single people, which is not a surprising finding on its own. What is more interesting is that frequency and satisfaction are not the same measurement, and relationship research consistently finds that satisfaction depends far more on communication, novelty, and emotional safety than on frequency alone. We got into the psychology behind that in 50 Ways to Spice Up Your Sex Life.
Single Life Has Its Own Advantages Here
Singlehood removes none of a person’s ability to explore their own desires and compatibility on their own terms, whether that is through casual dating or simply learning more about what they actually want before their next relationship. Platforms like AdultFriendFinder exist specifically to make that kind of exploration straightforward.
How to Actually Use This Research
- If you are single: Protect and invest in your friendships and family ties deliberately. The research says this is where singles already outperform married people, and it is one of the strongest levers you have for long-term wellbeing.
- If you are in a relationship: Do not let your friendships quietly disappear into the relationship. The “greedy marriage” effect is not inevitable, it is a pattern, and patterns can be interrupted with intention.
- Either way: Optimize for relationship quality, not relationship status. The research is remarkably consistent that quality is the variable that actually predicts health and happiness outcomes, not whether you are partnered at all.
Frequently Asked Questions
Do married people really live longer?
On average, yes, according to large meta-analyses, but the effect is driven heavily by marital quality and is strongest for people with existing health conditions. A strained marriage does not offer the same protective benefit as a strong one.
Is the marriage premium in earnings the same for men and women?
No. It is heavily skewed toward men, with married men earning meaningfully more than single men in most studies. Married women, single women, and single men see much smaller and more mixed effects.
Does being single actually hurt your social life?
The research points the other way. Multiple studies have found single people maintain broader, more active ties with friends, neighbors, and extended family than married people do, a pattern researchers call the “greedy marriage” effect.
Where can singles explore dating and intimacy on their own terms?
A platform built specifically for straightforward, low-pressure connection tends to work better than waiting for it to happen organically. AdultFriendFinder is one of the more direct options.
The Bottom Line
The research does not crown a winner between single life and relationship life, and the popular narrative oversimplifies both. Marriage carries real, documented advantages in longevity and earnings, concentrated more narrowly than most people assume. Singlehood carries real, documented advantages in social connection and autonomy that are consistently underrated. The variable that actually predicts wellbeing in both categories is quality, not status. That is worth building on purpose, whichever lifestyle you are in.
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