Menus Subscribe Search

Follow us


Oxytocin Levels Predict Longevity of Love Affairs

How far down the road will your relationship go? New research suggests oxytocin levels are the key to a long-lasting relationship. (Stockbyte)

Oxytocin Levels Predict Longevity of Love Affairs

• February 13, 2012 • 9:00 AM

How far down the road will your relationship go? New research suggests oxytocin levels are the key to a long-lasting relationship. (Stockbyte)

New research links levels of the “cuddle hormone” with falling, and staying, in love.

There’s nothing like the bliss of a new romance. And yet, many experiencing such rapture find it disrupted by a nagging question: How do we know our love will last?

Newly published research suggests a possible answer: Get your oxytocin levels checked.

A team of researchers led by Ruth Feldman of the Gonda Brain Sciences Center of Israel’s Bar-Ilan University have just published a study examining the role oxytocin, commonly called the “cuddle hormone,” plays in the early stages of romantic relationships. While differentiating cause and effect is tricky, the researchers find a strong link between lasting relationships and high levels of the hormone.

Oxytocin, as they note in the journal Psychoneuroendocrinology, promotes trust, bonding and attachment — between adults, and between parents and their offspring. (Less appealingly, it can also promote ethnocentrism.)

Feldman’s study featured 163 people in their early to mid-20s, 120 of whom had recently initiated a love affair. (On average, their relationship had begun 2.5 months prior to testing.) All had their blood tested for oxytocin levels.

“New lovers had substantially higher plasma levels of oxytocin, as compared to non-attached singles,” the researchers report. “These findings are consistent with those reported for other mammals, particularly monogamous rodent species in which oxytocin has shown to play a critical role in the formation of pair bonds.”

Since they didn’t measure oxytocin levels before the relationships began, Feldman and her colleagues can’t say for certain whether they increased during the romantic bonding process, or whether “individuals with high levels of oxytocin are more likely to fall in love.”

Six months later, the researchers located 54 of the 60 couples and retested the 36 who were still together. Their oxytocin levels were still at the same high level, which either explains or reflects the fact they were still happily bonded.

Perhaps the most striking finding: “Couples who stayed together showed higher oxytocin levels at the initial period of romantic attachment” than those who broke up. “These findings suggest that oxytocin in the first months of romantic love may serve as an index of relationship duration,” the researchers write.

This brings to mind the intriguing possibility of oxytocin-enhanced relationship repair — couples counseling augmented by hormone injections. In previous studies, raising people’s oxytocin level (via nasal spray) “was found to increase bonding-related behavior, including … trust and empathy,” the researchers note.

That said, the study raises a chicken-and-egg question, since it isn’t clear whether high oxytocin levels lead to more closeness or whether romantic behavior increases oxytocin levels.

During their initial testing, the lovers were interviewed about their relationship and observed while talking together. The researchers found a correlation between oxytocin levels and their level of “interactive reciprocity” — which is to say, their responsiveness to one another and tendency to engage in affectionate touching.

“Oxytocin is known to function as a bio-behavioral feedback loop,” the researchers note, adding that “research in mammals showed that more touch and contact increased oxytocin receptor density.” This suggests loving couples may get into a positive routine in which “higher levels of reciprocity and touch” allow them to maintain elevated oxytocin levels, sustaining their feeling of emotional connection.

So couples may not need artificial administrations of the cuddle hormone; they may just need to cuddle.

Sign up for the free Miller-McCune.com e-newsletter.

“Like” Miller-McCune on Facebook.

Follow Miller-McCune on Twitter.

Add Miller-McCune.com news to your site.

Subscribe to Miller-McCune

Tom Jacobs
Staff writer Tom Jacobs is a veteran journalist with more than 20 years experience at daily newspapers. He has served as a staff writer for The Los Angeles Daily News and the Santa Barbara News-Press. His work has also appeared in The Los Angeles Times, Chicago Tribune, and Ventura County Star.

More From Tom Jacobs

A weekly roundup of the best of Pacific Standard and PSmag.com, delivered straight to your inbox.

Recent Posts


October 21 • 8:00 AM

Education Policy Is Stuck in the Manufacturing Age

Refining our policies and teaching social and emotional skills will help us to generate sustained prosperity.


October 21 • 7:13 AM

That Cigarette Would Make a Great Water Filter

Clean out the ashtray, add some aluminum oxide, and you’ve (almost) got yourself a low-cost way to remove arsenic from drinking water.


October 21 • 6:00 AM

Fruits and Vegetables Are About to Enter a Flavor Renaissance

Chefs are teaming up with plant breeders to revitalize bland produce with robust flavors and exotic beauty—qualities long neglected by industrial agriculture.


October 21 • 4:00 AM

She’s Cheating on Him, You Can Tell Just by Watching Them

New research suggests telltale signs of infidelity emerge even in a three- to five-minute video.


October 21 • 2:00 AM

Cheating Demographic Doom: Pittsburgh Exceptionalism and Japan’s Surprising Economic Resilience

Don’t judge a metro or a nation-state by its population numbers.


October 20 • 4:00 PM

The Bird Hat Craze That Sparked a Preservation Movement

How a fashion statement at the turn of the 19th century led to the creation of the first Audubon societies.


October 20 • 2:00 PM

The Risk of Getting Killed by the Police If You Are White, and If You Are Black

An analysis of killings by police shows outsize risk for young black males.


October 20 • 12:00 PM

Love and Hate in Israel and Palestine

Psychologists find that parties to a conflict think they’re motivated by love while their enemies are motivated by hate.


October 20 • 11:00 AM

My Dog Comes First: The Importance of Pets to Homeless Youth

Dogs and cats have both advantages and disadvantages for street-involved youth.


October 20 • 10:00 AM

Homophobia Is Not a Thing of the Past

Despite growing support for LGBT rights and recent decisions from the Supreme Court regarding the legality of same-sex marriage, the battle for acceptance has not yet been decided.


October 20 • 8:00 AM

Big Boobs Matter Most

Medical mnemonics are often scandalous and sexist, but they help the student to both remember important facts and cope with challenging new experiences.


October 20 • 6:00 AM

When Disease Becomes Political: The Likely Electoral Fallout From Ebola

Will voters blame President Obama—and punish Democrats in the upcoming mid-term elections—for a climate of fear?


October 20 • 4:00 AM

Coming Soon: The Anatomy of Ignorance


October 17 • 4:00 PM

What All Military Families Need to Know About High-Cost Lenders

Lessons from over a year on the beat.


October 17 • 2:00 PM

The Majority of Languages Do Not Have Gendered Pronouns

A world without “he.” Or “she.”


October 17 • 11:01 AM

How to Water a Farm in Sandy Ground

Physicists investigate how to grow food more efficiently in fine-grained soil.


October 17 • 10:00 AM

Can Science Fiction Spur Science Innovation?

Without proper funding, the answer might not even matter.


October 17 • 8:00 AM

Seattle, the Incredible Shrinking City

Seattle is leading the way in the micro-housing movement as an affordable alternative to high-cost city living.


October 17 • 6:00 AM

‘Voodoo Death’ and How the Mind Harms the Body

Can an intense belief that you’re about to die actually kill you? Researchers are learning more about “voodoo death” and how it isn’t limited to superstitious, foreign cultures.


October 17 • 4:00 AM

That Arts Degree Is Paying Off

A survey of people who have earned degrees in the arts find they are doing relatively well, although their education didn’t provide much guidance on managing a career.


October 16 • 4:00 PM

How (Some) Economists Are Like Doomsday Cult Members

Cognitive dissonance and clinging to paradigms even in the face of accumulated anomalous facts.


October 16 • 2:00 PM

The Latest—and Most Mysterious—Player in the Nasty Battle Over Net Neutrality

As the FCC considers how to regulate Internet providers, the telecom industry’s stealth campaign for hearts and minds encompasses everything from art installations to LOLcats.


October 16 • 12:00 PM

How Many Ads Is Too Many Ads?

The conundrum of online video advertising.


October 16 • 11:00 AM

Unlocking Consciousness

A study of vegetative patients closes in on the nature of consciousness.


Follow us


That Cigarette Would Make a Great Water Filter

Clean out the ashtray, add some aluminum oxide, and you've (almost) got yourself a low-cost way to remove arsenic from drinking water.

Love and Hate in Israel and Palestine

Psychologists find that parties to a conflict think they're motivated by love while their enemies are motivated by hate.

How to Water a Farm in Sandy Ground

Physicists investigate how to grow food more efficiently in fine-grained soil.

Unlocking Consciousness

A study of vegetative patients closes in on the nature of consciousness.

Advice for Emergency Alert Systems: Don’t Cry Wolf

A survey finds college students don't always take alerts seriously.

The Big One

One company, Amazon, controls 67 percent of the e-book market in the United States—down from 90 percent five years ago. September/October 2014 new-big-one-5

Copyright © 2014 by Pacific Standard and The Miller-McCune Center for Research, Media, and Public Policy. All Rights Reserved.