Why does Holden stop making out with girls?

Holden Caulfield stops making out with girls primarily due to his deep emotional turmoil and fear of genuine intimacy. He struggles with feelings of alienation and vulnerability, often pushing people away to avoid getting hurt. Additionally, his idealization of innocence, particularly regarding his deceased brother Allie, makes it difficult for him to engage in physical relationships without feeling a sense of loss or guilt. Ultimately, his actions reflect his broader struggle with maturity and connection in a world he perceives as phony.