Everything in this book is about sex. Everything. The case Merry gets at the beginning? Sex. The reason she returns to Court? Sex. Her objective to become the next queen? Sex. All guys that flock around her want sex. She always want sex. The goblins are made of nothing but sex. Everyone's backstory contains something important about sex. We get constant descriptions of sex and genitalia. Merry's every thought pertains to sex. 
 Basically, if you like sex as a plot, this is the book for you. Me? Not so much.