In June 1956, he met Isabel Sarli on a television show. He later offered her the opportunity to star in "El trueno entre las hojas (Thunder in the Leaves)." Bo convinced Sarli to be naked in a scene in which she bathed in a lake, though she had previously been told she would wear a flesh-colored body stocking. The film became the first to feature full frontal nudity in Argentine cinema. Bo and Sarli became lovers and she became the primary star of his films until his death in 1981.