I've been reading "at" a book titled, "Sex Before Dawn." (Not getting very far very fast because my attention is focused more on what I'm writing than what I'm reading, but . . .) What's really fascinating is the discussion about how shifting from a hunter/gatherer society to an agrarian one also shifted societal mores. Not necessarily for the better. Anyway, the "dark matters" thread reminded me and thought it might be a book that would interest you 
