Why we kiss: the science behind the practice of lip-locking

For all the smooching we do in our lives, have you ever wondered why humans kiss? Here are some theories about our lip-locking habits.

News . Written by Beatrice Fanucci.

This article is about why people kiss. In the photo, two people kissing with a background of green leaves.
Image: Via Pexels - Ketut Subiyanto

We kiss our loved ones to express affection, we kiss strangers in the club, we kiss our partners to show love. For some LGBTQ+ folks, kissing can be also self-discovery, a way to understand what – or better yet, whom – we’re attracted to. It is such a commonplace practice that we don’t even stop to question it anymore. Yet, for all the pecks and smooches that we give or receive in our lives, do we actually know why humans kiss?

According to some, kissing is a learned behaviour rather than an instinctual one. As this theory explains, it dates back to our early ancestors and how mothers used to chew food before passing it from their mouths to those of their toothless babies (kind of gross, we agree).

This theory seems to be supported by the fact that kissing is actually not a universal human experience. While about 90% of the people on earth do kiss, there are certain tribes around the world that simply don’t do it.

However, another theory behind the reason why we kiss is an exchange of data. Very clinical, I know, but apparently our lips are densely populated with nerve endings, which allow us to pick up on temperature, taste, smell and other bits of information. The load of data that we get from a smooch then allows us to unconsciously assess potential partners.

Scholars who support this theory believe that there are such things as deal-breaking kisses, also referred to as “kisses of death” (a bit grim, but ok), which determine whether or not someone chooses another person as a partner. This, however, doesn’t necessarily mean that the people involved are bad at smooching, as kissing is a very personal experience and someone can be a good kisser to one while being a bad kisser to another. If we find someone that we like making out with very much, it might be an indication of the fact that we’ve found a good match.

Lastly, another vastly popular theory behind why we lock lips is that it simply feels good. Those millions of nerve endings on our lips are activated when they come into contact with another’s and they cause all sorts of chemical reactions in our brains.

As biological anthropologist Helen Fisher explains, a kiss can drive up our dopamine system and dopamine is associated with feelings of romantic love. Moreover, kissing may cause bursts of oxytocin, also referred to as the “cuddle hormone”, which stirs up feelings of affection and attachment. Last but not least, it reduces our levels of cortisol, the body’s main stress hormone.

With all the benefits that we get from a bit of lip-locking, it’s really no surprise that we do it so often. And the relevance of kissing becomes even more clear if we reflect on the fact that sometimes we are not allowed to do it. Something as common as kissing is still precluded to some – be it for unease, fear or even, in certain context, the law – which is why every last one of our kisses should be special.

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