Along with the oxytocin and dopamine that make you feel affection and euphoria, kissing releases serotonin — another feel-good chemical. It also lowers cortisol levels so you feel more relaxed, making for a good time all around.

How does it feel after 1st kiss?

It can leave you feeling less than satisfied, or feeling nothing, Klapow says, at which point youll feel free to move on. He points out, though, that since many first kisses are awkward — due to nerves and other factors — you might want to give it two or three more kisses, before you really know for sure.