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I recently watched a documentary about Eugene Debs, which included film of his release from prison in 1921. I was surprised to see that many of the men present greeted him by kissing him on the lips.
Was this practice widespread at the time?
I'm going to say it was normal. Probably not "common". It would be normal under highly emotional personal conditions.
The 1927 film Wings included an on the mouth kiss between two male best friends (first same sex kiss in film) as one of the men was dying.
Required, but never shown