_Its physiology—Its evolution: Instinctive period—Emotional period (Individual choice)—Intellectual period (Platonic love)—Its pathology—How can sexual instinct deviate from the normal course?—Anatomical and social causes—Psychological causes: (a) unconscious, (b) conscious._
CHAPTER VI. · THE SEXUAL INSTINCT.
From The Psychology of the Emotions by Théodule Ribot.
