BERLIN — The first time Michael Adamski saw his mother-in-law naked it was awkward.

But it wasn’t as awkward as seeing his boss naked.

Mr. Adamski, a police officer in Berlin who investigates organized crime, first started going to a nudist camp at a lake outside Berlin after he met his wife, whose family owned a cabin there.

One weekend, when he had just about gotten used to stripping in front of his in-laws, he bumped into the highest-ranking colonel in his precinct — who promptly challenged him to a game of table tennis.