Science reveals: What happens when you kiss?

It's time for an open conversation on this topic! Before the holiday of love, we talk about kisses.

Kissing is the romantic ending to many of the stories we tell, the many films we watch. It is a passionate moment in which the two realize their love through action-driven romance. We dream about our first kiss and are afraid of the last, and when we think it's bad we quickly forget it.

Why is there a need to reach out to our lips to express love? Is kissing something a person learns or is it instinct? And do all people around the world do that?

When we touch our lips in love, passion, respect, or greeting, we carry on a history-bound connection ritual. Excitement, facial expression, and different behavior are common in mammals, but humans are the only species that deliberately touches the lips - with the exception of our closest relatives (chimpanzees), who do so for other reasons. Kissing them is a sign of reconciliation.

Researchers on the subject say that the reasons why people are kissing are still debated despite the fact that kissing has been investigated for decades. They say it may be an innate, subconscious move coded in our genes.

According to Cheryl Kirschenbaum, author of The Science of Kissing, a wonderful example of kissing as a form of behavior is its maintenance over the centuries. People seem to have an instinctive urge to connect with someone, but our culture and personal experiences are also greatly influenced.

People kiss for a different purpose and with different partners for different reasons. In fact, there is a divide in romantic-sexual kissing behavior among modern people: according to a 2015 study, less than half of the 168 cultures surveyed use this form to satisfy romantic-sexual impulses. The sexual style of kissing that we may think is commonplace may be considered brutal elsewhere, as those cultures may not be kissed for sexual pleasure.

Studies of physical fitness and kissing reactions have found that using mouth muscle releases oxytocin, which suggests that the need for kissing is innate. Also, human lips are full of nerve endings and this makes them at least 100-200 times more sensitive than fingers.

Kissing, especially with the use of language, leads to an improvement in the immune system as it involves literally exchanging saliva, and thus bacteria, which increases the ability to tolerate bad pathogens. According to researchers, excitement reduces the feeling of nausea, which is necessary for the act that puts us at risk of infecting another person with bacteria. When exchanging kisses, both the saliva secretion and testosterone levels increase. It also increases the levels of endorphin and dopamine in the central nervous system.

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