There's much to support the idea that Holden is gay:
He tap dances in bathrooms
He goes into great detail decribing how good-looking Stradlater and other guys are
He is never successful with women
He critiques everyone he meets (in a bitchy manner)
He develops a "mother fixation" with older women
He doesn't go into great detail describing the physical appearance of women (as opposed to what he does with men)
He doesn't play really "hard" sports. (The fencing team is a "sissy" team)
...yeah, it can be argued that Holden is gay.
"Long live God!" (GODSPELL)