Ecstasy (1933, Czech.) (aka Ekstase)

In this heavily-censored, controversial Czechoslovakian romantic drama by Czech filmmaker Gustav Machat- a landmark 'sex in cinema' production, featuring the nude appearance of a major character - and the first theatrically-released film (non-pornographic) in which the sex act was depicted (although off-screen); it was unusual at its time for depicting obvious female sexual pleasure (ecstasy) during orgasm (simulated) from the effects of oral sex:

• the main character - sexually-frustrated child-bride Eva Hermann (19 year old Hedwig Kiesler, or later known as Hollywood glamour queen Hedy Lamarr); now a newly-wed bride and married to elderly, impotent, uncaring husband Emile (Zvonimir Rogoz); the couple did not consummate their love with sexual relations
• the scandalous scenes of a naked Eva - allegedly one of the earliest nude appearances in cinematic history
• her prancing about in the nude - a skinny-dipping bathing swim, a naked forest romp through the trees to pursue her horse Loni (which had run off with her clothes), retrieved by virile engineer Adam (Aribert Mog); she hid in the bushes and begged for her clothes back

Eva's (Hedwig Kiesler/Hedy Lamarr) Scandalous Nude Scenes
Skinny-Dipping	With Her Horse	In the Forest

• closeups of Eva's convincing face during a love-making scene (nudity implied)