After watching a middle aged referee check out the tush of a 12 year old (middle school) cheerleader, the sweet young things do not have to shake anything in any kind of suggestive way to get the kind of attention you're talking about.
IMO, parents at the school district level should be the ones to put a stop or allow whatever is within "community standards", rather than having state legislation about this.
BINGO!
Its a reflex glance. We can't help it. We look away when we realize the target is off limits.