erotic theory refrences?

Does anyone know a resource or book that talks about eroticism in fiction? I am not looking for porn. I mean a serious educational book.

Considering things from a writing standpoint would be best, but a general overview of the topic is fine too.

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i have a fast connection so i don't have to wait
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there's always some new site
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i browse all day and night
FOR PORN
it's like i'm surfing at the speed of light
FOOOOR PORN
trekkie!
THE INTERNET IS FOR PORN
THE INTERNET IS FOR PORN
WHY YOU THINK THE NET WAS BORN
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