How we cite our quotes: (Part.Chapter.Paragraph) or (Part.Paragraph)
Quote #4
He rolled onto his side, eyes fixed and unseeing, and indulged a cinema fantasy; she pounded against his lapels before yielding with a little sob to the safe enclosure of his arms and letting herself be kissed; she didn't forgive him, she simply gave up. He watched this several times before he returned to what was real; she was angry with him […] (1.8.4)
There's a contrast here between Cecilia yielding, which is false, and Cecilia angry, which is true. But… we find out later that Cecilia isn't really angry, even if she thinks she is, and we see her yielding. With sex, as with everything else in the novel, truth and fiction are hard to pin down.
Quote #5
Then, after a few moments' reverie, tilted back on his chair, during which time he thought about the page at which his Anatomy tended to fall open these days, he dropped forward and typed before he could stop himself, "In my dreams I kiss your c***, you sweet, wet c***. In my thoughts I make love to you all day long." (1.8.15)
The implication is that his Anatomy keeps opening to the page showing the female genitalia. Sex for Robbie is self-reflective; he thinks about it through books and words and dreams. Is sex self-reflective for Paul? It doesn't seem to be. The thing that is supposed to make Robbie a sex maniac, then—the fact that he thinks about sex—could be seen as the exact thing that makes him not a maniac.
Quote #6
"How appalling for you. The man's a maniac."
A maniac. The word had refinement, and the weight of medical diagnosis. All these years she had known him and that was what he had been. (1.10.34-35)
Lola labels Robbie a maniac just after she's been assaulted by the actual maniac, Paul. Briony is excited to have the right word. She loves words, remember. You wonder if she accused Robbie just because she's so excited to have her vocabulary confirmed.