Come as You Are

I would recommend this book for every woman.
Emily Nagoski does a great job of creating analogies for complex systems of sexuality. The text is easy to read, but works best if you take the time to stop and think what she's discussing and how it may have applied to your real life experiences.
I found it provides a very interesting framework for understanding sexuality and arousal, even though the intended audience is women, there is enough in common for men to learn something new about themselves and their sexual partners.