Most guys at Pencey just talked about having sexual intercourse with girls all the time – like Ackley, for instance – but old Stradlater really did it. I was personally acquainted with at least two girls he gave the time to. That’s the truth.
– J. D. Salinger
The Catcher in the Rye. Chapter 7. This shows Holden’s innocence. He knows about sex, but when it comes to it he is just an innocent boy. Uncomfortable with his own sexuality, he is fascinated but a bit grossed out by a guy who is experienced with women.