Julia is Winston's love-interest and his ally in the struggle against Big Brother. She represents the elements of humanity that Winston does not: pure sexuality, cunning, and survival. While Winston simply manages to survive, Julia is a true survivalist, using any means necessary to conduct her self-centered rebellion. Her demeanor is that of a zealous Party follower, but just under that thin surface is an individual with unchecked human desires and a willful spirit, which ultimately results in her capture.
While Winston enjoys sex and intimacy, Julia is an outwardly sexual being and sleeps with Party members regularly — at least before she meets Winston. She does not do this to destroy the Party but to quench her own desires, and that is the fundamental difference between Winston and Julia. His rebellion is as much for future generations as it is for himself; her rebellion is purely incidental to her own desires.
Julia is far more intuitive and realistic than Winston. She understands the Party better than he does and is more cunning in the ways that she defies Party doctrine. While Winston is emotional about the Party and its potential downfall, Julia feels his wishes are merely fantasy and is apathetic to the Party's dogma. She busies herself with getting around the Party, unlike Winston, who wishes to attack the Party at its center.
