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fathers and sons kissing on the mouth as a greeting?

One other memory of that 1978 dinner: I was impressed to see that WFB [William F. Buckley] and CB [Christopher Buckley] greeted each other by unselfconsciously kissing on the mouth. I had never seen American fathers and sons do this, although it is (or was) common in the North of England, where I was born.

not that there’s anything wrong with it