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2025-11-19 00:01:49

Scientists Discover the Origin of Kissing — And It’s Not Human

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Kissing is one of humanity’s most cherished rituals—just think of the sheer variety of smooches, from the “wedding kiss” to the “kiss of death.” Now, scientists have discovered that the origins of this behavior, which is widespread among many primates, likely dates back at least 21 million years, according to a study published on Tuesday in the journal Evolution and Human Behavior.

In other words, our early primate relatives were sitting in a tree, K-I-S-S-I-N-G, in the early Miocene period. Moreover, the deep evolutionary roots of kissing suggest that Neanderthals likely smooched each other, and probably our human ancestors as well. The new study is the first attempt to reconstruct the evolutionary timeline of kissing by analyzing a wealth of observations about this behavior in modern primates and other animals.

“It is kind of baffling to me that people haven't looked at this from an evolutionary perspective before,” said Matilda Brindle, an evolutionary biologist at the University of Oxford who led the study, in a call with 404 Media. “There have been some people who have put ideas out there, but no one's done it in a systematic way.”

“Kissing doesn't occur in all human cultures, but in those that it does, it's really important,” she added. “That's why we thought it was really exciting to study.”
A collage of mouth-to-mouth contact across species. Image: Brindle, Matilda et al.
The ritual of the “first kiss” is a common romantic trope, but tracking down the “first kiss” in an evolutionary sense is no easy feat. For starters, the adaptive benefits of kissing have long eluded researchers. Mouth-to-mouth contact raises the odds of oral disease transfer, and it’s not at all clear what advantages puckering up confers to make it worth the trouble.

“Kissing is kind of risky,” Brindle said. “You're getting very close to another animal's face. There could be diseases. To me, that suggests that it is important. There must be some benefits to this behavior.”

Some common explanations for sex-related kissing include mate evaluation—bad breath or other red flags during a smoochfest might affect the decision to move on to copulation. Kissing may also stimulate sexual receptiveness and perhaps boost the odds of fertilization. In platonic contexts, kissing could serve a social purpose, similar to grooming, of solidifying bonds between parents and offspring, or even to smooth over conflicts between group members.

“We know that chimpanzees, when they've had a bit of a bust up, will often go and kiss each other and make up,” Brindle said. “That might be really useful for navigating social relationships. Primates are obviously an incredibly social group of animals, and so this could be just a social lubricant for them.”

Though most of us have probably never considered the question, Brindle and her colleagues first had to ask: what is a kiss? They made a point to exclude forms of oral contact that don’t fall into the traditional idea of kissing as a prosocial behavior. For example, lots of animals share food directly through mouth-to-mouth contact, such as regurgitation from a parent to offspring. In addition, some animals display antagonistic behavior through mouth-to-mouth contact, such as “kiss-fighting” behavior seen in some fish.

The team ultimately defined kissing as “a non-agonistic interaction involving directed, intraspecific, oral-oral contact with some movement of the lips/mouthparts and no food transfer.” Many animals engage in kissing under these terms—from insects, to birds, to mammals—but the researchers were most interested in primates.

To that end, they gathered observations of kissing across primate species and fed the data into models that analyzed the timeline of the behavior through the evolutionary relationships between species. The basic idea is that if humans, bonobos, and chimpanzees all kiss (which they do) then the common ancestor of these species likely kissed as well.

The results revealed that the evolutionary “first kiss” likely occurred among primates at least 21 million years ago. Since Neanderthals and our own species, Homo sapiens, are known to have interbred—plus they also shared oral microbes—the team speculates that Neanderthals and our own human ancestors might have kissed as well.

While the study provides a foundation for the origins of kissing, Brindle said there is not yet enough empirical data to test out different hypotheses about its benefits—or to explain why it is important in some species and cultures, but not others. To that end, she hopes other scientists will be inspired to report more observations about kissing in wild and captive animal populations.

“I was actually surprised that there were so few data out there,” Brindle said. “I thought that this would be way better documented when I started this study. What I would really love is, for people who see this behavior, to note it down, report it, so that we can actually start collecting more contextual information: Is this a romantic or a platonic kiss? Who were the actors in it? Was it an adult male and an adult female, or a mother and offspring? Were they eating at the time? Was there copulation before or after the kiss?”

“These sorts of questions will enable us to pick apart these potential adaptive hypotheses,” she concluded.

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2025-11-18 19:32:14

HOPE Hacking Conference Banned From University Venue Over Apparent ‘Anti-Police Agenda’

The legendary hacker conference Hackers on Planet Earth (HOPE) says that it has been “banned” from St. John’s University, the venue where it has held the last several HOPE conferences, because someone told the university the conference had an “anti-police agenda.”

HOPE was held at St. John’s University in 2022, 2024, and 2025, and was going to be held there in 2026, as well. The conference has been running at various venues over the last 31 years, and has become well-known as one of the better hacking and security research conferences in the world. Tuesday, the conference told members of its mailing list that it had “received some disturbing news,” and that “we have been told that ‘materials and messaging’ at our most recent conference ‘were not in alignment with the mission, values, and reputation of St. John’s University’ and that we would no longer be able to host our events there.”

The conference said that after this year’s conference, they had received “universal praise” from St. John’s staff, and said they were “caught by surprise” by the announcement.

“What we're told - and what we find rather hard to believe - is that all of this came about because a single person thought we were promoting an anti-police agenda,” the email said. “They had spotted pamphlets on a table which an attendee had apparently brought to HOPE that espoused that view. Instead of bringing this to our attention, they went to the president's office at St. John's after the conference had ended. That office held an investigation which we had no knowledge of and reached its decision earlier this month. The lack of due process on its own is extremely disturbing.”

“The intent of the person behind this appears clear: shut down events like ours and make no attempt to actually communicate or resolve the issue,” the email continued. “If it wasn't this pamphlet, it would have been something else. In this day and age where academic institutions live in fear of offending the same authorities we've been challenging for decades, this isn't entirely surprising. It is, however, greatly disappointing.”

St. John’s University did not immediately respond to a request for comment. Hacking and security conferences in general have a long history of being surveilled by or losing their venues. For example, attendees of the DEF CON hacking conference have reported being surveilled and having their rooms searched; last year, some casinos in Las Vegas made it clear that DEF CON attendees were not welcome. And academic institutions have been vigorously attacked by the Trump administration over the last few months over the courses they teach, the research they fund, and the events they hold, though we currently do not know the specifics of why St. John’s made this decision.

It is not clear what pamphlets HOPE is referencing, and the conference did not immediately respond to a request for comment, but the conference noted that St. Johns could have made up any pretext for banning them. It is worth mentioning that Joshua Aaron, the creator of the ICEBlock ICE tracking app, presented at HOPE this year. ICEBlock has since been deleted by the Apple App Store and the Google Play store after being pressured by the Trump administration.

“Our content has always been somewhat edgy and we take pride in challenging policies we see as unfair, exposing security weaknesses, standing up for individual privacy rights, and defending freedom of speech,” HOPE wrote in the email. The conference said that it has not yet decided what it will do next year, but that it may look for another venue, or that it might “take a year off and try to build something bigger.”

“There will be many people who will say this is what we get for being too outspoken and for giving a platform to controversial people and ideas. But it's this spirit that defines who we are; it's driven all 16 of our past conferences. There are also those who thought it was foolish to ever expect a religious institution to understand and work with us,” the conference added. “We are not changing who we are and what we stand for any more than we'd expect others to. We have high standards for our speakers, presenters, and staff. We value inclusivity and we have never tolerated hate, abuse, or harassment towards anyone. This should not be news, as HOPE has been around for a while and is well known for its uniqueness, spirit, and positivity.”

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