Smooching feels good, of course, but couples first started swapping saliva as a way to test out genetic compatibility.
Trust is essential to social interaction among humans. However, have you ever wondered why we trust other people at all?
When you first happen upon that special someone, you start to feel romantic, passionate, giddy and euphoric. These feelings aren’t purely psychological. If we were to take a blood sample, we’d discover high levels of certain chemicals in your blood.