Defined in the following exchange between Catherine Gates (Ann Sheridan), an American lieutenant, and Henri Rochard (Cary Grant), a Frenchcaptain, in I Was a Male War Bride (1949): -- Catherine: ' You know, Henri, I've been thinking. Why do we fight all the time? ' -- Henri: ' You tell me.' -- Catherine: ' Oh, just sex antagonism I guess.' -- Henri: ' What does that mean? ' -- Catherine: ' Well, I don't know exactly, but I think it means just the opposite of what it sounds like.' -- Henri: ' I can't even think what it sounds like.' -- Catherine: ' Oh, Henri, I think it means we really like each other but won't admit it.' See also: love-hate for more quotes.