I've been told that before myself, I believe by my father (who was a chemical engineer and a pretty fair mechanic). I think he was talking more about starting your car cold and driving it twenty feet into the garage, then turning it off.
In driving (even for only ten minutes), I'd venture to say the exhaust system in a Boxster (or most any car) would heat up to the point to where the small amount of water produced by combustion would quickly evaporate. Don't worry about it.
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