From Newsgroup: talk.origins

https://abcnews.go.com/US/21-million-year-smooch-kiss-occurred-humans-study/story?id=127668915

https://www.sciencedirect.com/science/article/pii/S1090513825001370?ref=pdf_download&fr=RR-2&rr=9a0ef885ca797e7d

Some researchers are making the observation that monkeys do not "kiss",
but great apes do. They think this means that the common ancestor of
the "larger" apes first started kissing with their lips.

Not hard science, just hard not to laugh at.

Ron Okimoto

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