That's only one reason why he is a trooper and not a DA. Sure, he could be arrested, and maybe even charged, with just about anything. But if you honestly believe a streaker at a football game would get convicted for anything other than a misdemeanor like "disorderly conduct" you are kidding yourself. Nudity, in an of itself, is not sexual. And a football game, is not a place where minors gather, though some might be in attendance. Any judge would laugh that out of the courtroom, if they tried to pin a sex crime on him.
Now, if he stopped and jacked it a bit---well, then you may have a point.