Kissing's Origins Go Back 20M Years - Scorecard - MDSpire

Kissing's Origins Go Back 20M Years

Bayesian phylogenetic modeling suggests kissing emerges deep in primate evolution and persists across multiple ape lineages, including extinct hominins.

  • By

  • Kathryn Wighton

  • February 3, 2026

  • 3 min

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Clinical Scorecard: Kissing's Origins Go Back 20M Years

At a Glance

CategoryDetail
ConditionEvolutionary origins of kissing
Key MechanismsPhylogenetic analysis and Bayesian modeling
Target PopulationLarge apes and Neanderthals
Care SettingComparative evolutionary biology

Key Highlights

  • Kissing likely evolved in the common ancestor of large apes 21.5 to 16.9 million years ago.
  • Neanderthals had a high probability of engaging in kissing (posterior probability of 0.843).
  • Kissing is defined as non-agonistic, directed oral-to-oral contact without food transfer.
  • Phylogenetic analyses indicate kissing distribution is explained by shared ancestry.
  • Sparse data limits reliability of kissing estimates outside large apes.

Guideline-Based Recommendations

Diagnosis

  • Kissing behaviors should be documented across species with observational evidence.

Management

  • Utilize Bayesian phylogenetic modeling for evolutionary studies of behaviors.

Monitoring & Follow-up

  • Assess kissing behaviors in both wild and captive populations.

Risks

  • Sparse and uneven data may lead to inaccurate conclusions about kissing behaviors.

Patient & Prescribing Data

Not applicable; study focuses on evolutionary biology.

Understanding kissing's evolutionary context may inform behavioral studies.

Clinical Best Practices

  • Employ non-anthropocentric definitions for cross-species behavioral comparisons.
  • Acknowledge cultural variations in human kissing behaviors.

Related Resources & Content

Original Source(s)

Kissing's Origins Go Back 20M Years

  • by Kathryn Wighton

  • February 3, 2026

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