All this talk about running shorts reminds me of something that happened to me a few weeks ago...
I was running in some short clingy running shorts at about 8 at night when this rasberry honda with four girls drove by me. As they were passing one brown haired cutie shouted out the back window "I CAN SEE YOUR NUTS" and they drove off giggling. I wasn't prepared for this and I was caught off gaurd without a comeback. Nonetheless, two miles later, the same group of college girls came driving up behind me making cat calls about my nuts and whistling. I grabbed my crotch and yelled "IF YOU LIKE THEM NOW WAIT TILL THEY'RE SLAPPING YOUR CHIN". The driver thought what I said was so funny she almost wrecked into some cyclist...
Moral of the story: if you've got a huge sack, rock the short shorts for the horny ladies.