"In ancient Mesopotamia, which is the name for the early human cultures that existed between the Euphrates and Tigris rivers in present-day Iraq and Syria, people wrote in cuneiform script [wedge-shaped marks] on clay tablets... and they contain clear examples that kissing was considered a part of romantic intimacy in ancient times, just as... part of friendships and family members’ relations," said Dr. Troels Pank Arbøll, an expert on the history of medicine in Mesopotamia at the University of Copenhagen in Denmark.
"Therefore, kissing should not be regarded as a custom that originated exclusively in any single region and spread from there but rather appears to have been practiced in multiple ancient cultures over several millennia," added Troels.