Is Kiss Your Mate Day an official or public holiday?

No. It is an unofficial observance with no proclamation or legal status, so it is a normal working day with banks, schools, and offices open.

Who started Kiss Your Mate Day?

No one is documented as its creator. There is no founder, organization, proclamation, or trademark on record, so it survives only as an internet-era listing day.

Does the word mate mean a friend or a romantic partner here?

Here mate means a romantic partner, spouse, or sweetheart, so the day is about kissing the person you are coupled with. It is not about friends or animal mating.

Is kissing a natural human instinct that everyone shares?

No. A 2015 study of 168 cultures found romantic kissing in only about 46 percent of them, and it was absent among many foraging and farming peoples, so it is better understood as a learned custom than a universal instinct.

Kiss Your Mate Day

Next celebratedWednesday, April 28, 2027

When anthropologists checked the ethnographic record on 168 cultures, the romantic kiss appeared in just 46 percent; couples get this day for a gesture much of humanity never adopted.

See how to celebrate

Countdown to the day

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Last updated August 30, 2026 · by the Holiday Calendar TeamHave an update or spot an error?

YEARLY DATEApril 28

OBSERVED INInternationally

CATEGORYRelationships

SUBCATEGORYRomance

ORIGIN

Community Origin

FOUNDING ENTITY

Not documented

FIRST OBSERVED

Not documented

HOW THE HOLIDAY CAME TO BE

Greeting-card sites carry it; the trademark register is empty.

Kiss Your Mate Day circulates as an undocumented internet-era listing day on greeting-card and holiday sites. No primary record identifies who created it, when it began or why April 28 was chosen, and no proclamation or trademark is on file.

+ Know the story? Submit a founder Help us complete this holiday

INTRO

The kiss is not a human universal

Most of us assume everyone kisses. We are wrong. When three anthropologists checked the ethnographic record on 168 cultures in 2015, they found the romantic, sexual kiss documented in only 46 percent of them, 77 in all.

The other 91 cultures showed no trace of it. No ethnographer who lived among foraging or farming peoples in Sub-Saharan Africa, New Guinea, or the Amazon ever reported watching two lovers press their lips together. To them the gesture can read as strange, even disgusting.

Kiss Your Mate Day lands on April 28, a small couples' holiday that asks partners to do a thing much of humanity has never done. Before you pucker up, one quick correction: this is not the big global kiss day. International Kissing Day is July 6, and neither is Valentine's Day on February 14.

ORIGINS

Kiss Your Mate Day history

INTRODUCTION

The holiday is young and faceless. The act it celebrates is neither. To understand why a date on the calendar tells couples to kiss, it helps to ask a stranger question first: where did kissing come from, and did it ever really go everywhere?

The scientific name for studying it is philematology, from the Greek word for love. The act itself is called osculation. Both words are newer than the practice, which the written record traces back four and a half thousand years.

CHAPTER 01

The first written kiss

In 2023, two researchers read the cuneiform back to the source. Troels Pank Arbøll and Sophie Lund Rasmussen reported that clay tablets from Mesopotamia describe romantic lip-kissing by at least 2500 BCE. That pushed the documented record back roughly a thousand years.

Their argument cut against a tidy story. Kissing, they wrote, was not invented in one place and exported. It shows up across the ancient Near East as an ordinary part of human life, in more than one society at once.

CHAPTER 02

A practice that traveled

An older theory still has its defenders. Anthropologist Vaughn Bryant traces the earliest romantic-kissing references to four Vedic Sanskrit texts around 1500 BCE, where lovers press and rub noses. Clearer lip-kissing turns up later, in the Mahabharata and the Kama Sutra.

Bryant argues the habit spread west after Alexander the Great reached the Punjab in 326 BCE. His soldiers, the theory goes, brought it home. Scholars still disagree on who kissed first, which is the point: the origin of the kiss is contested, and honestly told, it is a debate rather than a fact.

CHAPTER 03

The holiday's own blank page

Against that long record, the holiday itself has almost no history. No greeting-card company, founder, or organization has ever claimed Kiss Your Mate Day. There is no proclamation, no trademark, and no documented reason April 28 was chosen.

It survives as an internet-era listing day, repeated from one holiday site to the next until it felt official. That absence is not a flaw to paper over. It is the honest shape of the day: a small, founderless invitation to do something most of the species learned, separately, a very long time ago.

WHY THIS DAY MATTERS

Why We Love Kiss Your Mate Day

SCIENCE

Couples kissed for 15 minutes, and the stress hormone fell.

A Lafayette College study led by neuroscientist Wendy Hill had 15 couples kiss for about 15 minutes, and cortisol fell in both partners. The longer the relationship, the steeper the drop in that stress hormone.

CHEMISTRY

It taps the brain's reward system

Kissing drives a surge of dopamine and central-nervous-system endorphins, per a commentary in The American Journal of Medicine. Sheril Kirshenbaum's 2011 book links that dopamine rush to the craving of new love and oxytocin to longer-term attachment.

CULTURE

It frames a practice as a choice, not an instinct

Because romantic kissing appears in fewer than half of sampled cultures, it reads less like a reflex and more like something people learn. A day built around it quietly celebrates a custom rather than a biological given.

BY THE NUMBERS

Kiss Your Mate Day by the Numbers

~80 million: Bacteria shared in a 10-second kiss
23-34: Facial muscles a passionate kiss engages
5-26: Calories burned per minute kissing
58h 35m: Longest kiss on record (set 2013, retired)
2500 BCE: Earliest written record of lip-kissing

TIMELINE

Timeline

Mesopotamia writes down a kiss

Clay tablets record lip-kissing as a normal part of romance, the earliest written evidence yet found.

Vedic texts press noses

Sanskrit verses describe lovers rubbing noses, the earliest romantic-kissing references one scholar cites.

Alexander reaches the Punjab

Returning soldiers may have carried the custom of kissing westward into the Mediterranean world.

A lab measures the chemistry

Neuroscientist Wendy Hill presented her study of cortisol and oxytocin in kissing couples on Valentine's Day.

Eighty million bacteria, sealed

Remco Kort's team showed a ten-second intimate kiss transfers about 80 million bacteria between partners.

The universal kiss is debunked

Jankowiak, Volsche, and Garcia found romantic kissing in fewer than half of 168 sampled cultures.

Western ethnocentrism, that is, the belief that a behavior currently deemed pleasurable must be a human universal.

Jankowiak, Volsche & GarciaAuthors, American Anthropologist (2015), via HRAF, Yale

GOOD TO KNOW

Kiss Your Mate Day Around the World

Northern Asia

Romantic kissing was nearly universal among the cultures sampled here.

North America

Indigenous and broader cultures here also showed romantic kissing at very high rates.

Sub-Saharan Africa

Among the foraging and farming peoples studied here, romantic kissing was absent from the record.

New Guinea

Among the foraging and horticulturalist groups studied, romantic kissing was absent from the record.

Amazonia

Foraging peoples here likewise showed no documented practice of romantic kissing.

GET INVOLVED

How to Celebrate Kiss Your Mate Day

Pucker up the moment you wake

Start the day with the kiss the holiday is named for, before phones and schedules take over. A slow morning kiss is the simplest way to mark April 28.

TRADE

Trade your weirdest kissing fact

Tell your partner that romantic kissing shows up in fewer than half of the world's cultures. It is an easy conversation starter that turns the day into something more than a peck.

RECREATE

Recreate your very first kiss

Go back to the place, the song, or the moment your first kiss happened. Reliving it gives the day a personal anchor instead of a generic one.

SEND

Send a kiss across the distance

If you and your mate are apart, a video call or a voice note keeps the day from passing unmarked. Long-distance couples can claim April 28 just as fully as anyone.

POST

Post a throwback couple photo

Share an old photo of the two of you and tag the date. It nudges friends to notice the day and pass the small holiday along.

Test your knowledge

How well do you know Kiss Your Mate Day?

1 / 9

In the 2015 study of 168 cultures, what share had documented romantic kissing?

Answer

No. Kiss Your Mate Day is April 28 and focuses on couples, while International Kissing Day is the larger global observance on July 6. Neither is Valentine's Day, which is February 14.

COLOPHON

Sources

How we know what’s on this page. References, not endorsements.

11sources

4primary records

10independently dated

Primary records

Science / AAAS2023-05-18

The ancient history of kissing

Mesopotamian clay tablets push the written record of romantic lip-kissing back to at least 2500 BCE.

View source

American Anthropologist (Wiley)2015

Is the Romantic-Sexual Kiss a Near Human Universal?

The Jankowiak, Volsche, and Garcia study finding romantic kissing in only 46 percent of 168 cultures.

View source

The American Journal of Medicine2013-06

Philematology: The Science of Kissing

Joseph S. Alpert on the muscles, calories, and neurochemistry of a kiss, and the terms philematology and osculation.

View source

Guinness World Records2023-07

Why did we deactivate the longest kiss world record?

The 58-hour, 35-minute record set in Thailand in 2013 and why the category was later retired.

View source

Additional coverage

Human Relations Area Files, Yale University2015-07-17

Romantic or disgusting? Passionate kissing is not a human universal

The 'Western ethnocentrism' quote and the regional breakdown of where romantic kissing is and is not found.

View source

ScienceDaily / Cell Press2015-08-05

Romantic kissing is not the norm in most cultures

Press summary of the 2015 study, with the 77-of-168-cultures finding and the absence among foragers.

View source

ScienceDaily / Microbiome2014-11-16

Up to 80 million bacteria sealed with a kiss

Remco Kort's study showing a ten-second intimate kiss transfers about 80 million bacteria.

View source

Science News2009

Kissing chemistry

Wendy Hill's Lafayette College study on how kissing lowered cortisol and shifted oxytocin in couples.

View source

NPR2011-02-11

The Science Of Kissing

Sheril Kirshenbaum on dopamine, oxytocin, and what kissing signals about attraction and attachment.

View source

ThePrint2023

Did Vedic Indians invent kissing? UK-Denmark study says liplocks go way back

Vaughn Bryant's dating of kissing references to Vedic texts and the Alexander-the-Great spread theory.

View source

Wikipedia

International Kissing Day

Confirms International Kissing Day, or World Kiss Day, is July 6, a different date from April 28.

View source

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