GWT,
You can always help them. Reach in and pull them out yourself. Or at least push the pants material back enough to let the guy's balls show. Don't deprive yourself, man.
I began seeing those metal bull balls hanging off trucks and trailers a couple years ago. Since I am in the center of sexual repression hell, I knew there was no sexual connotation to them. I just figured they were another redneck truck accessory, like the naked woman or Yosemite Sam mud flaps.