He cut off the supply of German nudist magazines to British, err, enthusiasts, as JB Priestley reported in 1937 (courtesy of Obscene Desserts):
'I went into [a wine bar in Southampton]; and it had a surprising succession of Ye Olde panelled rooms, in one of which I drank a shilling glass of moderate sherry and listening to four citizens talking earnestly about German nudist papers, their supply having recently been cut off by Hitler. Their interest in these papers was genuine but not of a kind to commend itself to the leaders of the nudist movement.'
Silly English perverts! They just didn't know where to look. The Nazis embraced Freikörperkultur, officially legalized nude bathing in 1942, and employed photographers such as Hans Suren to document National Socialist hotness:
More here (g).