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Story summary
- On Valentine's Day, Matilda Brindle of the University of Oxford discussed the perplexing nature of kissing.
- Kissing carries risks such as bacteria transfer.
- Kissing is observed in many animals, including prairie dogs and polar bears.
- She traced kissing back to a common ape ancestor dating to about 21 million years ago.
- She identified two types of kissing: platonic and sexual.
