Totally Agree. Balls take flashing to the next level, especially if you tie a ring around them to keep them nice and tight and pulled up to either side of your cock. Make them a prominent item to your audience. In fact, he needs to just strip off those pants and throw them to the side. Then, have fun with it. Quit worrying about someone walking up on you. After all, that's why you're out there, hoping someone will see you. (This comes from an avid exhibitionist who's been exposing himself for close to 60 years, and still doing it!)
I love BBC group sex