Humans likely started kissing as far back as 2500 B.C.E., based on evidence from ancient Mesopotamia and Egypt.
While the earliest documented evidence of kissing was once attributed to a text from India around 1500 B.C.E., recent research reveals an older history of the practice. This research highlights previously overlooked evidence from ancient Mesopotamia and Egypt that depict kissing dating back at least 4,500 years. These depictions weren't just religious or symbolic; they also showed commoners engaging in kissing.
Therefore, the understanding of when kissing began has shifted due to new evidence, pushing the date back at least 1,000 years earlier than previously thought.