Like to see the correlation with dental hygiene.
Of 168 cultures studied by anthropologists, people do romantic/sexual kissing in only 46% of them -- Justin Garcia at #HBES2017
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Now weight those cultures by population. There's a saying in anthro: "There's always a tribe in Papua New Guinea..."
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Kissing can be awkward. Or the expectation /taking-for-granted/obligation of it.
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Bummer for them. :( Missing out on some good times.
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