If you could exist exactly as you do right now, but without a ballsack, would you? You still have your junk in theory, like, you can have babies and stuff... No hair, no sweat, most importantly no excruciating pain when hit... But you'd kinda look weird.
Tough one... having sat on a nut just yesterday this question intrigues me. Probably not, but I realized you only have to worry about sitting on a nut when you're all hot and sweaty. That should probably be filed under "Duh" but I'd never considered it before.
It would be cool if your nuts could be transplanted to another part of your body like a colostomy bag.
It would be cool if they were just removable, like an accessory. And when you are about to have sex, you'd be like "Hold on, let me grab a condom...and my balls."