Kissing a romantic partner on the lips is a natural and common part of our modern-day society, but much remains to be learned about its origins. Humanity’s first-ever recorded instance of ...

It was previously believed the earliest evidence of romantic-sexual lip kissing in humans originated in South Asia 3,500 years ago.

The oldest documented evidence of intimate kissing is inscribed in Mesopotamian clay tablets dating to 2500 BC, according to research.

The researcher, at the University of Cambridge, suggested that the custom — a lip-kissing precursor that involved rubbing and pressing noses together — developed into hardcore smooching.