Early Cinema
I have heard that in the early years of movies, both in the silent era and later in the thirties, before there was a motion picture code, nudity was shown more in films. Women were allowed to be swimming and have their nude body revealed. Also European films remained much more open about nudity during the years that Hollywood was banning such scenes.
I believe that they were more willing to be groundbreaking those days, lets not forget that after the first world war, the world witnessed this artistic boom on several areas and the art world was certainly at the forefront: architecturally speaking you had for instance the Bauhaus movement, and as far as paintings were concerned, we had some pretty groundbreaking painters back then. Sadly, everything soon ended in a very sad way :/