Operator and Steeker:
I suspected it had to do with leaning over more. I wonder if Steeker doesn't have a problem because his road bike doesn't have him leaning over as much as most would. Can you elaborate, Steeker? If you think it is something else, I'd love to know!
DieselDan:
I understand the usual purpose of the road bike, but that, in itself, doesn't explain why regular shorts create major comfort problems. I can easily see ways they may help PERFORMANCE though.