Mistletoe’s associations with fertility and vitality have been around since the Middle Ages, and by the 18th century it had become widely incorporated into Christmas celebrations. Just how it made the jump from sacred herb to holiday decoration remains up for debate, but the kissing tradition appears to have first caught on among servants in England before spreading to the middle classes.

As part of the early custom, men were allowed to steal a kiss from any woman caught standing under the mistletoe, and refusing was viewed as bad luck. Yet another tradition instructed the merrymakers to pluck a single berry from the mistletoe with each kiss, and to stop smooching once they were all gone.

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