Julia uses sex to attack the Party, but it is far less effective a weapon than love. When Julia and Winston fall in love, they commit the ultimate offense against the Party. Note that the couple was caught at their happiest moment, the moment where they let down their guard and felt like an ordinary couple. Both had been watched for years and could have been captured at any time. But not until their love was strong did the Party intervene. Separating the couple diminishes their effectiveness: As individuals they do not understand the party wholly, nor are they capable of resistance.
Superficially, Julia seems like an uncomplicated character. She functions as a sounding board for Winston, but she is far more complicated than that. Winston has real antipathy toward women resulting from the Party's indoctrination and from its stringent sexual codes. Winston can remember a time when affection was shown for affection's sake and is angry at women for what the Party has done to them. Julia does not follow these strict sexual codes and, in fact, breaks them at every opportunity. She shows Winston, who once imagined raping and killing her, that the Party cannot get to the most intimate places in a human being's mind; she is his proof that the feelings that he has been having are valid. Julia gives Winston hope, and it is the continuation of this hope that gets them both destroyed.
