This was such a hard read, for a variety of reasons. It gets 3.5 stars from me!
I agree with other reviewers that the best thing is Gracie's "unabashed drive to have it all". "All" is, for most of the book, sex. Now, as a sex-positive person, there's nothing wrong with that, but Gracie appears to have focused on it to the exclusion of everything else, thus presenting a very reduced picture of the very interesting woman she seems to be (lots of interests, hobbies, opinions, activism, etc). Knowing that she is a multi-faceted, well-rounded individual, her characterisation of herself as a one-dimensional sex-deprived-and-crazed person is unfortunate. It really does paint a picture of an obsessive sex addict at times, though I know it's not the case. I truly wish I could've known more of the real Gracie.
I would also have expected Gracie, as a feminist, to be a little more LGBTQIA+ aware, especially regarding gender identity, gender roles, etc. I found there were parts of the book that were judgmental, prescriptive or generally perpetuating of gender stereotypes. Maybe I'm just hyper-sensitive though! I would also have expected a more sex-positive attitude from someone who so clearly understands having a big sex drive - at times she's outright judgmental. Casual sex might not work for Gracie, but it works for other people, and that ought to be OK.
SPOILERS: The book also lacks almost any introspection. It is so incredibly strange to see Gracie (and the other people in the book) wanting desperately to do something, getting permission to do it, and then reacting so negatively and without communication when a partner expresses a wish for the same thing. Despite all the mentions of polyamory, the book is mostly about a marriage transitioning to a friendship, and this transition overlapping with a new monogamous romantic and sexual relationship. Ultimately, it seems to be a transition from one monogamous relationship to another, with the big difference from the usual story being that the breakup wasn't a cesspool of hate. This is a monogamy->monogamy transition because the people in the book couldn't necessarily actually give each other the freedom to have other partners.
The conflation of love and sex was also pretty rampant, especially at the beginning, though admittedly it seems as if this was because Gracie was discovering herself as she went along. I wish all of this had been made more clear. Due to the flavour of poly I am intellectually more on board with, none of the above sat particularly well with me.
All of this said, I appreciate Gracie's complete candour immensely. It feels as if all the details were included, from the good to the bad. Lots of people could take a cue from the way Gracie handled her relationships, learning both what to do and what to avoid, which one can determine because the results are also, again candidly, included. There are many, many beautiful and heart-wrenching moments, filled with excitement and despair, and all the emotional rollercoaster you'd expect from such a story. It is worth reading both as a romantic novel as well as a sexual adventure, though the "story arc" is not particularly complex.
This is also a first-person account of the systemic and individual judgment and challenges facing poly people. I would like to think things have changed since the time of the events in the book, but I've heard of the same thing happening recently.
So, the book made me have all the emotions because of empathy towards the characters as well as frustration AT the characters! Recommended despite what I consider to be some relatively significant flaws :)