F-M Sex Face Quadriphasic Model (F-MSFQM), which scientifically analyzes facial expressions throughout the four phases of the human sexual response cycle: desire, excitement, orgasm and resolution, represents an unprecedented advance in the understanding of the emotional and physiological manifestations associated with human sexuality, defends Prof. Freitas-Magalhães, the world's leading expert for Neuroscience and Biobehavioral Psychology and the Encyclopedia of Human Behavior, by Elsevier, Oxford, in his pioneering and extraordinary book About the science of facial expressions during the human sexual response cycle.