I rated this book based on the importance of a book like this, not on my personal preference, as I'm not the intended audience.
In my opinion, this is a great book as an introduction to everything vulva, targeted at young teenagers. It's a good basic information, without going too much into depth, that gives the right information to have a basic knowledge of what it is exactly that it entails to have a vulva. I definitely wished I would have had a book like this to begin with (instead, my first contact with information like this was a brochure/information booklet provided by one of the biggest tampon brands in Europe - biased much?), so I would know what I was dealing with. I think the illustrations work wonders accompanying the texts: it's clear enough, but not too graphic to become almost intimidating. I particularly enjoyed the answer about male birth control, where Dr. Lincoln summarized a couple of projects that are currently being tested - it speaks to me this book was written in this age, where much more is known about female anatomy and sexuality.
I do think there could have been more emphasis on sexuality, however, but I also know that might be a touchy topic to begin with, and not the best one to be discussed by an OB-GYN.