What is Holden's rule he made for himself about sex in The Catcher in the Rye?

s rule about sex is that he is

not going to mess around with girls that irritate him, but he has trouble sticking to
his
rules.

Like most teenage boys, Holden
does not understand
sex.  He gets frustrated because he cant seem to stick to
his principles and morals.  He does
not want to associate with phonies, for
example.  Holden tries to protect himself from
self-loathing by making
rules.

Last year I made a rule
that I
was going to quit horsing around with girls that, deep down, gave me a pain in the
ass.
(ch 9)

Holden broke the rule
within a week.  He realized
that he did not understand girls, or sex.  He
spends time with crumby girls, in a crumby
way, and is unable to respect
himself or other girls.  Sex is just another aspect of life with
which Holden
feels uncomfortable and inadequate.