It boosts your 'happy hormones' Kissing triggers your brain to release a cocktail of chemicals that leave you feeling oh so good by igniting the pleasure centers of the brain. These chemicals include oxytocin, dopamine, and serotonin, which can make you feel euphoric and encourage feelings of affection and bonding.
If you have ever wondered why people kiss at midnight on New Year's Eve, according to English and German folklore, the first person you encounter in a new year — and the nature of this encounter — sets the tone for the rest of the year. A kiss is about strengthening ties you wish to maintain in the future.