It’s not as easy being a German naturalist as it used to be. Due to weight issues, more and more clothing has to be taken off or something and that’s become a real pain in the sunburned behind.
And then there are the demographics. Immigrants from Turkey and Arabic countries aren’t interested in “social nudity,” for some strange reason.
Nude sunbathing has a long tradition in Germany. The Free Body Culture (FKK) movement was founded in the early 20th century and succeeded in taking much of the smut and embarrassment out of nudity.