Yeah, so some crackpot (crackhead possibly?) reckons one in about 400 cyclists may develop impotency in later life (like, when they're 70 or something). Guess what? You'll also grow fur on your palms and all the hair on your head will fall out.

Until such time as someone does a credible study from a large sample which shows some conclusive results, I'll treat it with the contempt it deserves.