Why does holden refuse to give Sunny an extra five dollars?

Holden Caulfield refuses to give Sunny, the prostitute, an extra five dollars because he feels uncomfortable and conflicted about the situation. Despite being in a sexual context, he lacks the desire to engage in physical intimacy and instead feels a sense of pity for her. This moment reflects Holden's broader struggles with intimacy, loneliness, and his disdain for the adult world he perceives as phony. Ultimately, he prioritizes his emotional discomfort over the transaction.