When did humanity's first kiss happen and how? Answer is out

Have you ever thought that when humans started kissing? You may say it is an unanswerable question no matter how much one thinks about it, but researchers have discovered the answer to it. Humans first kissed each other around 4500 years ago. Evidence dates back to the Mesopotamian period.

Researchers discovered the secret of the kiss from scripts on a clay sculpture of that period. The writing was in cuneiform script. The sculpture was found in a place that is now Iraq-Syria area. The sculpture depicts a couple embracing and kissing each other.