What's Up Docs? Why do we kiss?
Feb 10, 2026
They explore why humans kiss and how to define kissing across species. The conversation covers possible functions like mate assessment, foreplay and social bonding. Microbiomes, oxytocin, health links and infection risks get attention. Cultural variation and why some people feel disgusted are also discussed.
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Fresh Eyes On Old Romances
- Chris Van Tulleken recounts rewatching Titanic and noticing many scenes he hadn't remembered.
- He uses that fresh-view experience to suggest revisiting old movies and songs can boost wellbeing.
Broad Cross-Species Definition Of Kissing
- Kissing is defined broadly as directed, non-aggressive mouth-to-mouth contact across species.
- This broad definition lets researchers compare kisses from humans to polar bears or fish objectively.
Kissing As Mate Assessment Or Arousal
- Romantic kisses may work for mate assessment or as pre-copulatory arousal.
- Mate assessment could signal health or immune compatibility via subtle cues gathered during kissing.