First kiss dates back 21 million years, say scientists

Researchers have traced the evolutionary origins of kissing, suggesting it dates back over 21 million years to the common ancestor of humans and great apes. The study, which focused on mouth-on-mouth contact with specific movements and no food transfer, found evidence of kissing behaviors in various animal species like primates, wolves, and polar bears. This research sheds light on the history of kissing as a behavior shared with our non-human relatives and even suggests that Neanderthals may have engaged in kissing as well.