In 1984 how does the theme of political control shape and mold Winston and Julia's relationship?
The fact that the government has so much control over their lives is what drives Julia and Winston together in the first place. They aren't driven together over mutual attraction; Winston is older and pretty unappealing, and Julia isn't that pretty. There is no freedom for them to be attracted to each other based on similar interests or values, and even talking to each other at all is suspicious. What drives them together is a mutual hatred of political control. They hate the Party. They want to act out against it, and getting together is the best way they know how to. In fact, Orwell writes that their intimacy is
"a battle, the climax a victory. It was a blow struck against the Party. It was a political act."
Their relationship, at first, was merely an act of rebellion against political control. And it felt good--the party says we can't feel love and that sex is bad? Well, take this, Party. We're going to love each other and enjoy it.
As their relationship progresses, political control governs its boundaries. They can't meet in public. They can't meet whenever they way. And, even though they love each other, "they did not discuss the possibility of getting married" because, as the book states, "no imaginable committee would ever sanction" their marriage. Their time together is restricted because of Hate week, and all of the party's activities that needed to be performed in order to not appear suspicious. And, at the end, when the awful betrayal happens, it is political control that determines the ultimate outcome of their relationship.
I hope that those thoughts helped; good luck!