In "Catcher in the Rye," how can Holden's fantasy of being the catcher in the field of rye be considered sexually perverse?

Akannan's answer is excellent. Just to add, there is
no suggestion of a sexual aspect of Holden's catcher in the rye fantasy. It is true, as
Akannan says, that seen through relevatively modern awareness of the presence
of paedophilia in society, a perverse slant might be given to it. However, I would argue
that this is unjustified on the basis of the book alone.

In
fact, it is arguable, that Holden's fantasy of catching the children in the rye is a
wish to be freed of sexual desire. The phrase "catcher in the rye" is Holden's
misunderstanding of Robert Burns poem "Comin Thro the Rye" which is sexual in that it
is about lovers kissing in the rye.

However, the fact that
Holden mishears the poem's title and gives it an asexual interpretation, it can be
argued, that it suggests that Holden's fantasy seeks to escape the sexuality associated
with maturation.