Did people always kiss?
Romantic kissing feels universal today, but it was not found in every human society. Written evidence suggests it appeared independently in places like India, Mesopotamia, and Egypt, and it may be older than writing itself.Human Mating: The Strange History of Kissing
It may have begun as a test
One idea is that humans kiss partly to judge a potential partner's health through smell. Another idea is even stranger: romantic kissing may have grown out of parental mouth-to-mouth feeding and later became a tool for pair-bonding.Human Mating: The Strange History of Kissing
