How is Winston and Julia's relationship a rebellion against the Party in 1984?

's rebellion
takes place on a more "intellectual" level than does 's.  Winston is inspired by the
(imaginary) work of Immanuel Goldstein.  When they are in bed in the room at Charrington's, he
reads part of the text to her; she falls asleep.  Julia's rebellion is more at the
"gut" level.  She doesn't seem to care about the ideology of revolution or Goldstein
or any of that.  She rebels against the control the part has over her life, and her rebellion
takes the form of intimate relationships with men (although we only know of Winston, she does
say that she has done this with other men).