The Origin of Kissing

New research has found evidence that human ancestors and great apes kissed approximately 21 million years ago, and that Neanderthals may have also kissed.

https://www.sciencedirect.com/science/article/pii/S1090513825001370

https://phys.org/news/2025-11-ape-ancestors-neanderthals-analysis.html

Previous research on the origin and evolution of kissing

https://onlinelibrary.wiley.com/doi/10.1002/evan.22050

https://www.abc.es/ciencia/herpes-simple-surgio-5000-anos-primeros-besos-20220727145857-nt.html

https://www.theguardian.com/education/2023/may/18/first-records-of-human-kissing-may-date-back-1000-years-earlier-than-estimated

https://www.bbc.com/mundo/noticias-62342524