The book's premise is that each of its five chapters is told from a different character's perspective, and the gimmick is in the first three chapters we have some severe overlap of three characters doing the same scene. While it provides you the character perspectives, by the third time the hotness is gone. This would be absolutely tiresome had not the author done something nice: in one chapter, a conversation was glossed over. In the next, he fully plays out that conversation. So you get the full experience by reading all three chapters, even if that experience is what's going on before the sex, not during or after. By simply glossing over the threesome on the third time, nothing would have been lost from the book.
As much as I am down on the repetitiveness, I genuinely think that the book takes off as soon as it's got the three-perspective-threesome out of the way. We're treated to genuine characterization, conflict, and in chapter four and five, tear jerkers. I will not shy away from the fact that chapter four really moved me, it got to me, because I have some personal experience with that sort of arena. It was well worth the price of admission.