oboe, I love ya for thinking of my reproductive health!
this is a revisiting of the very same issues raised about 5 years ago in major network media -- last time it discussed road cyclists.
the true problem causing impotence, inflamed prostates and lowered sperm counts is that most riders don't know how to properly adjust their saddles (seats). in fact, most don't even know that you can adjust the tilt of the saddle to make its nose lower, higher or flat relative to the seating area in the rear. the ones who had UT/RT dysfunctions usually had their saddles aimed too high at the nose, and the saddle nose was crushing tissue in the perineal area.