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Chastity was as deep ingrained in them as Party loyalty. By careful early conditioning, by games and cold water, by the rubbish that was dinned into them at school and in the Spies and the Youth League, by lectures, parades, songs, slogans, and martial music, the natural feeling had been driven out of them. (1.6.16)
Female Party members have been brainwashed since childhood about the importance of chastity as manifestation of one’s loyalty to the Party.
"We believe that there is some kind of conspiracy, some kind of secret organization working against the Party, and that you are involved in it. We want to join it and work for it. We are enemies of the Party. We disbelieve in the principles of Ingsoc. We are thought-criminals. We are also adulterers. I tell you this because we want to put ourselves at your mercy. If you want us to incriminate ourselves in any other way, we are ready." (2.8.16)
Winston and Julia profess their devotion and loyalty to the ultimate force of rebellion – the Brotherhood.