But this is for many reasons which aren't as much about cycling as they are about ignorance of reproductive problems.

If you get the right seat, set it to the correct height, and use PROPER cycling form (your bike fits, you use the right gear and cadence, you mix sitting and standing in the right proportions, etc)....the chance that you'll cause yourself problems is far less than the chance that you'll see a big boon to your health due to taking part in one of the best aerobic exercises out there.....

All strictly my humble opinion, but that's as a life-long professional in the cycling world :-)