All bike rallies I have been to this has not been an issue. The police have enough on their hands dealling with drunks and crowd control. If someone flashes, they turn their head and act like they didn't see it. They just want to get through the night without fighting.
BTY. I do have pics! But I can't post them here!
I would bet that you haven't been to Daytona for at least the last two years. They now have nipple inspectors (I gotta get that job!!), and decibel measuring.
Rev it too loud or flash one and you're paying for it. But you can still moon! :-)