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A Kiss Isn’t Just a Kiss: What Legal History Says About Consent and Culture
In A Nutshell
- Kissing isn’t universal: fewer than half of 168 surveyed societies have any tradition of romantic mouth-kissing
- Legal systems have treated kisses as property, contracts, evidence, and crimes, depending on the era and culture
- A kiss legal in one country, like a cheek peck in Paris, can lead to jail time in places like Dubai
- Courts increasingly treat a forced kiss as sexual assault, with cases in England, Italy, and Spain marking that shift
A single, simple act, a meeting of lips, has been treated by legal systems as property, a contract, and a crime, depending on where and when it happened. University of Kansas law professor Andrew Torrance traces that shifting history in a new analysis, and the record shows kissing has never had one fixed legal meaning. A kiss that draws a warm welcome in Paris can draw a jail sentence in Dubai. A gesture that once sealed an agreement or a marriage can, when forced on someone today, amount to assault or sexual assault. Torrance’s research shows how an act this small can carry a surprising amount of legal weight.
“Lawyers like me often come at it from an angle of ‘somebody performed a kiss and somebody didn’t want that, so what does the law say,'” Torrance said. “It turns out the law of the kiss has a long, varied history.” His analysis, published in the journal Evolution and Human Behavior, runs through four separate legal frameworks, property, contract, tort, and criminal law, each treating a kiss differently depending on the era and the culture.
Kissing Has Never Been a Universal Human Behavior
Torrance began by examining evolutionary theories for why kissing exists, including ideas linking it to feeding, grooming, bonding, and the exchange of saliva. Anthropological evidence painted a messier picture, with entire cultures skipping romantic mouth-kissing altogether. A cross-cultural survey covering 168 societies found that fewer than half, roughly 46 percent, had any tradition of it. Darwin noted the Fuegian people of South America had never heard of kissing and used nose-rubbing instead. The laws written around kissing have proven just as inconsistent from culture to culture.
How Kissing Entered Property and Contract Law
Legal history first cast the kiss as a kind of property, something that belonged to a person and could be given away or taken without permission. Torrance pointed to societies where a young woman’s kiss, taken without her patriarch’s consent, could bring punishment on the aggressor or be treated as a mark of lost virtue on her part. Roman custom carried its own property-flavored twist: husbands held the ius osculi, letting them check whether a wife’s breath smelled of wine, a sobriety test disguised as affection. This early legal history of the kiss treated the act less as a private matter between two people and more as something a family or a husband could own.
Kissing also found a place in contract law. Marriages, pacts, and other agreements have historically been “sealed with a kiss.” Torrance offered a colorful hypothetical: “What would it mean if a crime boss were to kiss the hand of another crime boss? It could be a sign of respect, a show of subservience to a superior or even a contract agreement.” Medieval Europe leaned on similar logic in its feudal loyalty ceremonies.
Modern Courts Now Treat Unwanted Kisses as Assault
Legal regulation eventually shifted toward tort and criminal law, where an unwanted kiss became a wrongdoing carrying real consequences rather than a matter of lost honor. A Victorian-era case from 1888 England involved a 15-year-old shop worker forcibly kissed by her employer; a judge instructed the jury that a kiss taken against someone’s will constitutes assault, language nearly identical to modern harassment law. Italy’s supreme court confirmed in a 2006 ruling that a sudden forced kiss on the mouth met the legal threshold for violent sexual abuse. Spain overhauled its sexual assault statutes after the widely publicized 2016 “La Manada” case, dropping the requirement that victims prove active resistance, a reform tested almost immediately when a federation president’s unsolicited kiss of a player made headlines worldwide.
That evolution reflects a broader move away from viewing kisses as tools the powerful use to control others and toward treating them as a matter of individual consent and gender equality. Application of the law remains inconsistent worldwide, though. A British couple spent a month in a Dubai jail over a peck on the cheek in a restaurant. Torrance also points to uneven enforcement against same-sex and mixed-race couples, historically arrested for affection that drew no attention when shown by other couples.
Where the Law of the Kiss Goes Next
Torrance’s conclusion pushes past cataloging history toward a normative claim. Regulating kissing well, he argues, means drawing on history, science, culture, and law together rather than leaning on outdated moralism. “The law is not just a set of rules that tries to constrict human behavior,” Torrance said. “It’s also a reflection of human values and how society views a certain behavior.”
His closing argument imagines a future where a loving kiss draws no punishment and an unwanted one draws no tolerance. “The ‘Bad Man’s Kiss’ is increasingly out of place, and the good person’s consensual kiss is recognized as a cherished liberty,” Torrance wrote. “In such a world, the law’s ultimate message about kissing might echo the gentle wisdom of evolutionary biology: It’s in our nature to connect, but it’s in our society’s interest to ensure those connections are consensual and kind.” Centuries of case law keep circling back to that same line: nobody owns the right to another person’s lips without their consent.
Disclaimer: This article summarizes findings from a single peer-reviewed legal analysis and is intended for general informational purposes. It does not constitute legal advice, and readers with specific legal questions should consult a qualified attorney in their jurisdiction.
Paper Notes
Limitations
Andrew Torrance’s paper is a legal and historical analysis rather than an empirical study, meaning it does not involve original data collection, surveys, or experiments. Its conclusions rest on secondary sources, including court records, historical texts, news coverage, and prior academic research, some of which, particularly older anecdotes about Puritan blue laws, rely on accounts that later historians have questioned as exaggerated or partly apocryphal. The cross-cultural claim that fewer than half of societies practice romantic mouth kissing comes from a single 2015 survey cited in the paper. As a work of legal scholarship built around comparative case analysis, the paper’s arguments reflect one scholar’s interpretive framework rather than a consensus finding, and readers should treat its historical anecdotes and proposed reforms as informed argument rather than settled fact.
Funding and Disclosures
The author reported no competing financial interests or personal relationships that could have influenced this work.
Publication Details
The paper, titled “Osculation Regulation – The Law of the Kiss,” was written by Andrew W. Torrance, Paul E. Wilson Distinguished Professor of Law at the University of Kansas School of Law and MIT Sloan School of Management. It was published in the journal Evolution and Human Behavior, volume 47 (2026), article number 106917, as part of a special issue titled “Evolution of Kissing.” The paper was received May 19, 2026, accepted May 22, 2026, and made available online June 4, 2026. DOI: 10.1016/j.evolhumbehav.2026.106917.
