I think the idea of brining your own towel - aside from being Arthur Dent - is so you don't transfer any dangerous skin-eating fungi to your hosts, or them to you. Also, people wipe their bottoms with those things after a bath, and then later, you go and dry your face.
That's why you always bring your own towel. You should dry your face with only your bottom cooties.
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"I can normally tell how intelligent a man is by how stupid he thinks I am" - Cormac McCarthy, All The Pretty Horses
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