When we think of a kiss, we imagine a deeply human expression of affection, intimacy or emotional bonding. But what if kissing did not begin with us at all? What if the gesture we treat as cultural, romantic or symbolic actually stretches back to ancient primates who lived long before humans even existed? New findings suggest that the roots of kissing may be 20 million years old, making it far older than humanity itself. This idea challenges everything we assume about where our behaviours come from and how far back our emotional instincts reach. A peer-reviewed study published in the Archives of Sexual Behavior examined the evolutionary origins of kissing and found that affectionate mouth-to-mouth behaviours appear in several primate species.

Kissing is an emotional expression of love whe

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