Well, Katie, I am Belizean of British and Spanish ancestory and it has a lot to do with religion and upbringing.
You will often see Belizean kids running around nude, swimming nude, and coed bathing but as we got older and er...more developed it ceased. Nudity is frowned on, just ask three good friends of mine about a late night escapade that landed them in jail for driving around Belize City in a mini moke nekked!!! What a scandal that was.