While it might seem like a simple romantic gesture, kissing is a complex biological event that evolved for critical survival and social reasons. 1. Nature’s Ultimate Compatibility Test
A passionate kiss triggers the release of several powerful neurotransmitters that light up the brain's pleasure centers: 15 Reasons to Smooch: How Kissing Benefits Your Health While it might seem like a simple romantic
: The exchange of saliva allows us to subconsciously pick up on a partner's immune system markers (MHC genes). Humans are often attracted to those with different immune system genes, which can lead to healthier offspring. which can lead to healthier offspring.