How we cite our quotes: (Part.Chapter.Paragraph)
Quote #1
Several hours later, when Julien left Madame de Rênal's room, one might have said, as they say these things in romantic novels, that he had nothing else to desire. (1.15.18)
Stendhal has a not-so-subtle way of telling us that Julien has had sex with Madame de Rênal, probably more than once. He decides to couch this claim in the language of romance novel. When he says that Julien "had nothing else to desire," he's saying that all of Julien's sexual urges have been satisfied. Bow chicka bow bow.
Quote #2
Even when there was nothing left to refuse him, she pushed Julien away, her indignation very real, and then threw herself into his arms. (1.15.20)
Madame de Rênal doesn't know how to act after she's committed adultery with Julien. First she pushed him away, then she throws herself into his arms. It's a concrete, physical way of showing that she doesn't really know what to do.
Quote #3
"If I ever get to leave the seminary for an hour or two, I might very well—wearing my bourgeois clothes—get to see Miss Amanda again." (1.24.49)
Julien knows that a girl named Amanda is interested in spending time with him. And if history holds true, we can assume that the main reason he's interested in seeing this girl is the thought of having sex with her.