Chimpazees - humans closest relatives - also engage in kissing.
Humans have been romantically kissing on the lips for about 4,500 years.
Researchers at the University of Copenhagen say the first evidence of smooching was recorded in the ancient Middle East.
The findings suggest kissing was normal in many cultures, and didn't originate in a specific region.
The husband and wife behind the study also found kissing may have contributed to the spread of cold sores.
Chimpazees - humans closest relatives - also engage in kissing.
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