Summary:
- The study suggests that the behavior of kissing may have evolved over 21 million years ago, dating back to the common ancestor of humans and other large apes.
- Researchers analyzed the behavior of bonobos, chimpanzees, gorillas, and orangutans and found that they all engage in kissing-like behaviors, indicating that this behavior has deep evolutionary roots.
- The ability to express affection through physical contact like kissing may have helped strengthen social bonds and cooperation among our ancient ancestors, which could have provided evolutionary advantages.