Cycler by Lauren McLaughlin
Link goes to and teaser from Goodreads.com
"As far as anyone at her high school knows, Jill McTeague is an average smart girl trying to get her dream date to ask her to the prom. But what no one knows, except for Jill’s mom and dad, is that for the four days Jill is out of school each month, she is not Jill at all. She is Jack, a genuine boy—complete with all the parts—who lives his four days of the cycle in the solitude of Jill’s room. But Jack’s personality has been building over the years since the cycling began. He is growing less and less content with his confinement and his cycles are more frequent. Now Jill’s question about prom isn’t about who she will go with, but who will she be when the big night arrives?"
*My Short but Sweet Review*
The premise and writing was great, it just fell a little flat for me. I think that there were too many twists and that things weren't fleshed out as much as it could have been.
Also, with Jack-- everything went back to sex, and even if guys really think that way- there needs to be more depth for me.
I liked the friendships in this book, and I like that the mom is very involved in Jill's life, even though there are problems, big ones, with her interactions with Jack.
I would love to hear what you think and if you have written a review, I would love if you link it and I will read and comment.