While the story of Adam and Eve makes for a nice fairy tale, I understand that there are societal norms that prevent public nudity.
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There are some resorts in the DR that cater to nudists, but I don't know of any publicly accessible beaches where the practice would be allowed in the DR.
But allowed in the streets of Santiago, if they are ugly.
If they are a woman with a fairly nice body, then the police pick them up real fast!
I have seen that concept in action here in Santiago a few times.
SantiagoDR