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Yes, Nijmegen got hit almost as bad as Rotterdam (the worst bombing by the germans) and that was also because of allied forces thinking they were flying over germany. It was the 80 year memorial a few weeks ago. Unfortunately, more than a few people died in Nijmegen.
I am dutch and I have never heard of this issue/myth. Even tour de grance cyclists manage to have kids just fine after 20 years of full time cycling, so I wouldn’t worry.