There was not a lot of nudity in mainstream productions in 1964. To my knowledge, Fonda was the only major star who showed any goodies.

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There was nudity in grindhouse and drive-in films, and there was substantial nudity in the Pawnbroker, but if you begin and end the discussion with big-name mainstream stars, Jane was out there in her own universe, working for a director who became her husband.

Some movie trivia for you cinephiles: what does Circle of Love have in common with Eyes Wide Shut and Becket?