I think there are some cultural differences that manifest themselves in German attitudes toward nudity in certain situations. One sees many naked Germans on southern European beaches that tolerate it; often these are older and/or obese bodies.

I still remember my surprise when swimming in an elegant hotel pool in Germany to see some middle-aged guy get out of the pool and proceed to remove his swimming costume (speedos IIRC) totally and stand there naked as the vacuum extractor machine (that thing that's used to get swimwear almost dry) did its cycle. He acted as if it were the most natural thing in the world to parade around naked after his swim and no one else seemed to notice.