is it that he does something particularly hy-einous in the scene, or is it just the regular stuff, and she was not up for it?

(calling it "the regular stuff" feels wrong. it may be de rigueur in a max hardcore film, but it is an extremely perverted set of expectations. )
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They're all human beings, and though she may be a liar and a manipulator, it's probably because she doesn't know any other way to survive.