Favorite Non-Fiction Sex Books?

Contributor: evanescentowl evanescentowl
I'm not talking about "based on a true story" erotica here, more like textbook type material. Instructional material, position books, that sort of thing is what I had in mind.

Do you guys have any recommends? Any favorite authors? Have you come across any written by complete quacks?
06/08/2013
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