What happens to your body when you kiss someone for the first time?

When we kiss, our bodies jump into overdrive, and release a burst of adrenaline. Its like that fight or flight response we have all heard about, Klapow says. The heart rate goes up, muscle tension increases, our breathing rate speeds up, and blood flows to our internal organs.

What happens to a guy when you kiss?

Kissing causes a chemical reaction in your brain, including a burst of the hormone oxytocin. Its often referred to as the “love hormone,” because it stirs up feelings of affection and attachment. According to a 2013 study, oxytocin is particularly important in helping men bond with a partner and stay monogamous.