Kissing in a friendly or fraternal way "should not be considered as a custom that originated exclusively in a single region and spread from there," says Dr. Pank Arbøll.
In the cuneiform writing of ancient Mesopotamia there were clear examples of its existence, as well as "a substantial corpus of medical texts, some of which mention a disease with symptoms reminiscent of the herpes simplex virus 1" Researchers believe that the thing will not stop here and that pathogens will give for more, depending on future research of ancient DNA.