Originally Posted by JumpinJesus

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.