> Male genitalia. Cyclists completely kill off their male reproductive parts. If you cycle your whole life for daily commuting to places then you'll certainly end up with fertility issues and probably require assistance to get erected in older age. No thank you lol.

This is mostly an urban legend. I am a amateur cyclist and during my testicles checkup I asked to my andrologist if it's better to stop while I am looking for a son. He replied that there is no any scientific evidence about damage on testicles by bike and that I can continue without worrying about them. Other factors like smoke are a lot more risky