Not sure if this fits since some of the characters aren't furries (it's about 50/50 so far), but I think Forest Keep is a pretty good one:http://forestkeep.net/
It's a work in progress, and it hasn't been published as an actual book yet. Chapters 1-47 are available for download from the archive as a PDF file, chapter 48 is on the Current Chapter page, and 49 and 50 (as well as all the previous ones) are posted on FA and sofurry.com under the username "shimrod".
There are a few sex scenes, but they're presented in a tasteful manner (in my opinion). Also, while some of those scenes (particularly the first ones for the various couples) are vital to the plot, they aren't the main focus of the story. Instead, it mainly revolves around the romance between the couples and the resulting clash of cultures/species.