What’s in a Kiss? 21 Million Years of Evolution
Researchers used phylogenetic mapping to trace mouth‑to‑mouth kissing back through primate evolutionary history and conclude the behavior likely existed in the common ancestor of all apes about 21 million years ago. The finding, published in the journal Evolution and Human Behavior, treats kissing as nonaggressive mouth‑to‑mouth contact that does not involve passing food. Lead author … Read more