We need a BBB policy. No showing of boobs, bellies, or butts.
It appears that the problem is even more widespread, if you'll pardon the pun, than the 3B's. From the article:
This year's version calls for a warning and phone call to parents the first time a student exposes his or her sexual organs, even if covered by underwear, in a vulgar or indecent manner.
(Emphasis added)
Although I'm not sure how it's possible for children to expose their sexual organs in a 'decent' manner in a school setting......