This is a study of sexual excitement. It is the fifth book -perhaps more accurately, the fifth chapter in one work - on masculinity and femininity (gender identity). This is a study of sexual excitement. It is the fifth book - perhaps more accurately, the fifth chapter in one work - on masculinity and femininity (gender identity), carrying forward ideas examined in my last book, Perversion. As many have noted since Freud said it decades ago, it is so difficult to draw a line between excitement one can call "perverse" and normal excitement that the word 'normal' loses definition. - From the Introduction by the Author
The other four books are: 1. Sex and Gender: The Development of Masculinity and Femininity 2. The Transsexual Experiment 3. Splitting: A Case of Female Masculinity 4. Perversion: The Erotic form of Hatred