My AS 15-year-old son keeps in touch with an Italian girl he met a few months ago in a museum in Amsterdam. Of course, it probably helps that he's very good-looking, so girls are more likey to approach him.
For myself, even if someone approaches me on vacation, I'm terrible about keeping the connection going once I'm back home.
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"Donkeys live a long time. None of you has ever seen a dead donkey."