With the establishment of the Hollywood Production Code in the early 1930s, directors were limited in how much sexual behaviour they could depict on screen. There wouldn’t be a Hollywood movie like Ecstasy, the 1933 Czechoslovakian film [that showed Hedy Lamarr nude and having an orgasm]( http://www.bbc.com/culture/story/20140527-how-10-movie-taboos-were-broken), for decades. But clever filmmakers like Alfred Hitchcock found ways of subverting the Code. He decided to include “the longest kiss in movie history” in his film Notorious, despite the Code’s decree that Hollywood kisses must be limited to three seconds or less. So rather than just one long kiss, Hitchcock had Cary Grant and Ingrid Bergman pucker up intermittently while locked in an embrace for two and a half minutes – during which time they also move around an apartment arm in arm, talk on the phone and discuss a chicken dinner, with the kissing serving as punctuation for their dialogue. Hitchcock may not have actually violated the Code, but he certainly did in spirit. (RKO Radio Pictures)