Winnipeg Free Press - PRINT EDITION

Kiss and tell

There's as much science as sex in that Valentine's Day kiss

  • Print

The Science of Kissing

What Our Lips Are Telling Us

By Sheril Kirshenbaum

Grand Central Publishing, 246 pages, $22.50

Chances are that at least one kiss is etched among your deepest memories. With input from all five senses, a torrent of hormones, and high emotional stakes, our brains are rarely more active than during a kiss.

As we near Valentine's Day, University of Texas researcher Sheril Kirshenbaum gives us even more to think about before, during and after this popular pastime in her book The Science of Kissing.

With a tone that is lighthearted but never unprofessional, scholarly but not sterile, she takes a short trip through the origins, physiology and future of osculation.

Readers who are concerned that too much science will unweave the rainbow needn't worry. While it is traditionally poets' territory, a little rational understanding enhances rather than undermines the wonder and romance of the kiss.

Why take kissing so seriously? At first sidelong glance, it appears a silly custom: swapping saliva and bacteria, without an obvious purpose.

Yet, kissing is near-ubiquitous today, alluring and mysterious, with enormous cultural significance, an event that can begin, sustain -- or sometimes stop short -- our most important relationships.

As a field of research, kissing is beginning to receive greater academic attention. Evolution, history, anthropology and medicine can all shed light on when and why we kiss.

Within our own culture, Kirshenbaum notes that kissing "is better advertised than Coca-Cola" so it's easy to assume that the behaviour is universal. However, people throughout history have kissed in different ways and for different reasons, or sometimes not at all.

Kissing makes its first documented appearance in India, around 1500 BC. Centuries later India gave us the Vatsyayana Kama Sutra, which, among its varied subject matter, includes an entire chapter on kissing.

The Old and New Testaments are peppered with kisses, including kisses of deception, of betrayal and of peace, not to mention the racier sort in the Song of Solomon.

Today, kissing customs vary from one country to another. The French are famous for their signature style, which they call a "soul kiss," but a quick kiss on the cheek is a common greeting between friends and family in France, throughout much of Europe and Latin America.

In Turkey, people share friendly cheek kisses with their own gender but never the other, while kissing in public is reportedly frowned upon in Finland, Thailand and India.

All this variation across time and space is fodder for one of the great kissing debates: genetic or cultural? Kirshenbaum plays the referee, giving arguments from both sides.

If we evolved to kiss, why did European visitors to the Pacific island of Mangaia find its inhabitants innocent of mouth-to-mouth kissing, despite being the most sexually active culture in recorded history?

On the other hand, cultures that do not kiss invariably have some form of "substitute" like sniffing or rubbing noses.

Many members of the animal kingdom, from apes to cats to porcupines, exhibit kissing-like behaviour. Then, there is man's best friend: "If it's a noun," Kirshenbaum writes, "chances are a dog will lick it."

Different forms of animal "kissing" serve to establish hierarchy, build trust, sample taste or scent, groom, soothe, or to pass along regurgitated food. There is no one reason that animals kiss, and no one reason that we do.

Certainly, kissing can profoundly affect our bodies. During a passionate kiss, our facial muscles work in concert, our cranial nerves light up with new sensory data, while our cheeks flush and our pulse quickens.

Kissing releases a myriad of hormones and neurotransmitters, including dopamine, an energizing drug that leads to feelings of euphoria, anticipation, lost appetite, and sometimes even obsessive or addictive behaviour.

Because dopamine is unleashed by new and exciting experiences, the effect wanes as two people grow accustomed to one another. The desire to recapture that euphoria is certainly a culprit in many extramarital affairs.

Luckily, there are other hormones at work helping to foster long-term attachment, and chief among them is oxytocin (not to be confused with OxyContin). Oxytocin is a potent substance credited with sustaining the parent-child bond and keeping the love alive between happily married couples.

As kissing reliably produces oxytocin (and sex even more so), it is not merely an outward sign of a healthy relationship. By kissing often, couples can literally make it easier and more enjoyable to stay together.

Kirshenbaum also gives some good reasons to hold back from a kiss. On the emotional side, an ill-timed kiss, when the mood is wrong, can extinguish rather than ignite a relationship.

Moreover, kissing can spread mononucleosis, Type 1 herpes, meningitis, strep throat and a host of other maladies, so your partner ought to be worth the risk.

Kissing may be unhygienic and not strictly necessary for procreation, but it has withstood every attempt at eradication, and shows no sign of going out of style.

The Science of Kissing covers extensive ground, and will likely leave readers wanting more detail. Still, it shows how much there is to learn about the subject, and how much still belongs to wonder and mystery.

Paul Klassen is an engineer who writes, and lives with his wife, in Winnipeg.

Republished from the Winnipeg Free Press print edition February 12, 2011 H10

Fact Check

Fact Check

Have you found an error, or know of something we’ve missed in one of our stories?
Please use the form below and let us know.

* Required
  • Please post the headline of the story or the title of the video with the error.

  • Please post exactly what was wrong with the story.

  • Please indicate your source for the correct information.

  • Yes


  • This will only be used to contact you if we have a question about your submission, it will not be used to identify you or be published.

  • Cancel

Having problems with the form?

Contact Us Directly
  • Print

You can comment on most stories on You can also agree or disagree with other comments. All you need to do is be a Winnipeg Free Press print or e-edition subscriber to join the conversation and give your feedback.

You can comment on most stories on You can also agree or disagree with other comments. All you need to do is be a Winnipeg Free Press print or e-edition subscriber to join the conversation and give your feedback.

Have Your Say

New to commenting? Check out our Frequently Asked Questions.

Have Your Say

Comments are open to Winnipeg Free Press print or e-edition subscribers only. why?

Have Your Say

Comments are open to Winnipeg Free Press Subscribers only. why?

The Winnipeg Free Press does not necessarily endorse any of the views posted. By submitting your comment, you agree to our Terms and Conditions. These terms were revised effective April 16, 2010.


Make text: Larger | Smaller


Key of Bart - Cali For Jets Nation

View more like this

Photo Store Gallery

  • Marc Gallant / Winnipeg Free Press.  Local/Weather Standup- Catching rays. Prairie Dog stretches out at Fort Whyte Centre. Fort Whyte has a Prairie Dog enclosure with aprox. 20 dogs young and old. 060607.
  • A Canada goose protects her nest full of eggs Monday on campus at the University of Manitoba- Standup photo- Apr 30, 2012   (JOE BRYKSA / WINNIPEG FREE PRESS)

View More Gallery Photos


Do you agree with the sale of the Canadian Wheat Board to foreign companies?

View Results

View Related Story

Ads by Google