Kissing is a deeply intimate human act, yet its origins remain surprisingly shrouded in mystery. When we mention kissing, we typically refer to lip-to-lip contact that encompasses suction and pressure, which may sound less romantic when phrased that way.
So, why do humans kiss?
Throughout history, kissing has held various meanings across different cultures. The earliest recorded human kiss can be traced back to Ancient Mesopotamian texts from 2500 BC.
Among the ancient Romans, there were three distinct types of kisses: Palate (a friendly kiss on the cheek), Basium (a platonic kiss on the lips shared among partners and family), and Sabium (a passionate kiss between lovers).
Clearly, kissing has always been more than just a romantic gesture.
Despite its prevalence, kissing is not universal; a 2015 study covering 168 cultures published in American Anthropologist found that only 46% of people engage in romantic lip kissing. Cultures that forego kissing often find alternative ways to express intimacy.
On the Trobriand Islands near Papua New Guinea, couples engage in amusing acts like nibbling each other’s eyelashes. Charles Darwin notably described a Malayan kiss, where people squat and smell each other, hinting that scent may play a significant role in human intimacy.
Can biology shed light on why we kiss? Research indicates that kissing serves a biological bonding function, releasing oxytocin, hormones linked to trust and attachment.
Oxytocin reduces stress, enhances feelings of closeness, and strengthens the bond between romantic partners. Perhaps that’s why kissing feels so good.
According to evolutionary theory, the origins of lip-to-lip kissing may stem from early maternal behaviors such as breastfeeding and pre-chewing food (where mothers chew the food before delivering it to infants).
This behavior is still observed among primates like chimpanzees, which may indicate that lip contact originated as a signal of care and bonding.
Human infants are biologically wired for lip contact and associate it with comfort and safety. This may have evolved into broader social behaviors tied to caregiving and emotional connection.
However, theories centered on mammalian lip-to-lip behavior may not entirely explain the romantic aspect of kissing.
A recent bold theory proposed by evolutionary psychologist Dr. Adriano Lameira at the University of Warwick suggests that kissing may have evolved from grooming behaviors.
In primates, grooming often culminates in oral contact, such as cleaning fur. As humans gradually lost body hair, hygiene practices may have shifted, leading to shorter grooming sessions and ultimately the emergence of the lip-to-lip kiss as a lasting expression of affection.
Ultimately, kissing is a complex behavior, likely shaped by our ancient ancestors, fulfilling a deep human need for connection, whether it’s passionate like Sabium or intimate like smelling a gentle scent.
This article addresses the question “Why do we kiss?” as asked via email by Dani Castillo.
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Source: www.sciencefocus.com