Your just asking for a good case of pavement rash my friend riding a large motorcycle with shorts on....A few years back I got stung by a bee right in my crotch riding with shorts, and as I am allergic to bee-stings, I almost did not make it home...If you want to hear some other negative reasons, ask those that work in Emergency rooms in hospitals...My son-in-law, who also rides, is a Supervisor in an Emergency room in Oklahoma and he will be more than willing to share his horror stories with you....Please be careful and ride safe.....