The saliva bathes the back of the postage stamp that, once dried, remains attached to the letter.
From Wikipedia:
“Water-activated stamp — for many years, water-activated stamps were the only type available, so this term entered into use with the advent of self-adhesive stamps. The adhesive or gum on a water-activated stamp must be moistened (usually by licking, thus the stamps are also known as «lick and stick»).”
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