catcher in the rye- chapter 14

Holden is thinking about Allie. Sunny and Maurice come to Holden's room demanding he give them 5 more dollars for the prostitue that Holden didn't have sex with. Holden sais that it isn't fair, but after an arguement and Maurice hitting Holden, the two just take the money from him. I think Holden is dumb in this chapter and the one behind it. If he asks for a prostitute and pays for the prostitute, then why not have sex with the prostitute? I think Holden is just too immature to have sex.