Check out this link I found on About.com...it lists a whole bunch of places for adults only. I thought it was funny to learn that one hotel in Barbados allows children only during hurricane season.
Adult-Only Hotels/Resorts Links also featured on the page for adults only are the Honeymoons/Romantic Travel and the Nude Beach Guide.
P.S.
Would any of you ever have the nerve to partake in the nude beach/nude resort thing?? I wonder if they keep them childfree? How awkward would THAT be if they didn't!!