This book is a good explanation of how the menstrual cycle works and how individuals can understand their own through cervical mucus, body temperature, and other signs. The writing and explanations are clear and understandable, and the sample charts and review quizzes are useful. Directed to teen girls 14 to 18, it does come off a little condescending — at the very least, trying too hard to be witty and accessible. Less easy to forgive are some messages the author slips in in the chapter on sex. I was disturbed by the victim-blaming in Weschler's advice to girls to try to "prevent" their own date rapes. Need I point out that no one ever wants or chooses to be raped, and that the one responsible for rape is the rapist? Furthermore, the take-home message in the chapter on sex is that a girl's "first time" is a crucial and life-changing moment that must be done with the right person or it will cause regrets forever, and the discussion of sexually transmitted infections regurgitates the stereotype that STIs are caused by, and serve as the punishment for, promiscuity (or, as Weschler would put it, women who don't "respect" themselves). It's unfortunate and disappointing that Weschler's book, particularly one for teens, contains such blatantly sexist and shaming messages, especially as Weschler does a great job encouraging women to love their bodies and feel empowered by them. Overall, it's a useful resource for learning about menstrual cycles and cycle-charting, but the other sections are best avoided.