Hi! So I read Boy Toy around the middle of 2011. I went to Borders and picked it up and read it in less than a week.
I say pause at 14 and under specifically because by the time kids are in 8th grade they have already been exposed to the things in this book. The sex in this book is pretty graphic, but also really low key in a sense. Parents should be aware of Josh and other characters language, because it is very strong. Even with what I say, you should pause and think about letting them read this book.
I really liked the story. Josh was a strong character but he certainly had his flaws. He was a little dense despite his seemingly bright character, he had those flickers that actually weren't all that bad, and he apologized WAY too many times for my tastes. I loved Rachel, his friend, and Zik. They were great characters for the book. I also loved the romance. Rachel was so perfect for this and she just blew my mind in how wise she was. She said things that made you go "wow." I loved how she was a strong but girly character that really just KNEW what she was doing.
Anyways, the book was real good. I'd recommend parents letting kids 14 & older (after thinking about it) take a go at this book. Please think about how mature your children are in the process so they do not "hurt their brain" or be "scarred for life".