This was utterly unhinged and I had the best time reading it.
My fiance read this before I did, and from his reactions I already knew I was going to love it. It is narrated with razor sharp wit and apathetically blunt observations about its characters. Our protagonist slips between being viciously self-aware and intentionally naïve, stubbornly refusing to address the issues in her life, that I couldn't help but feel my heart break for her despite her every effort to repulse and distance the reader.
The writing style is right up my street and I was hooked from the very first sentence, if you enjoyed My year of rest and relaxation then you'll understand what I mean when I say that Boy Parts falls into that specific genre of wickedly entertaining and altogether horrible female narrators. The hooks leading up to the denouement were well placed and not immediately obvious, which makes that reflective hindsight of what you missed creeping up on you so much sweeter in my opinion.
The last third of the book for me didn't feel quite as tight and well-honed as the first two, although I appreciate that some of that is due to the wandering path our protagonist takes.
All this to say, I thought this book was spectacular and I will be keeping an eye out for Clark's other novel for certain.