Why him? why her?

This book provides a new way to understand relationships by analyzing four broad, biologically-based styles of thinking and behaving linked with the dopamine, serotonin, testosterone, and estrogen systems in the brain.

Based on her pioneering work and data from over 28,000 individuals, Fisher explains how these personality types influence who we love and how to use this knowledge to build and sustain happy long-term relationships.

The book includes a scientifically developed questionnaire, the Fisher Temperament Inventory, which has been validated by brain scanning experiments and used by millions worldwide.