It's even more frustrating when they take over the plot and make it longer, so I suppose I really shouldn't be complaining since they kept it fairly short this time.

Yyyyup. The book mentioned in the fic is real. The contents mentioned in the fic were fictional because I couldn't get my hands on said book to look it up, but hey. I remember somewhere in my research seeing a whole list of ancient Chinese books all about sex. It was rather amusing.