Provocative, ground-breaking and entertaining, the world's leading expert on sexuality and the ovulation cycle reveals the hidden intelligence of hormones. In this paradigm-shifting book, Martie Haselton explains how hormonal intelligence works - both its strengths and its weaknesses - and shows women how to track and understand their desires, fears and perceptions with a radical new understanding of the biological processes that profoundly influence our behaviour. Rigorously researched, entertaining and empowering, Hormonal offers women deep new insights into their bodies, brains and relationships, and will encourage women everywhere to embrace the genius of female biology.