TESTOSTERONE TESTOSTERONE AN UNAUTHORIZED BIOGRAPHY Rebecca M. Jordan-Young Katrina Karkazis Cambridge, Massachusetts London, England 2019 Copyright © 2019 by the President and Fellows of Harvard College All rights reserved Printed in the United States of Amer i ca First printing Jacket design: Jill Breitbarth 9780674242654 (EPUB) 9780674242661 (MOBI) 9780674242647 (PDF) The Library of Congress has cataloged the printed edition as follows: Names: Jordan-Young, Rebecca M., 1963– author. | Karkazis, Katrina Alicia, 1970– author. Title: Testosterone : an unauthorized biography / Rebecca M. Jordan-Young, Katrina Karkazis. Description: Cambridge, Massachusetts : Harvard University Press, 2019. | Includes bibliographical references and index. Identifiers: LCCN 2019012123 | ISBN 9780674725324 (hardcover : alk. paper) Subjects: LCSH: Testosterone. | Testosterone—Public opinion. | Masculinity in popular culture. Classification: LCC QP572.T4 J67 2019 | DDC 612.6/1—dc23 LC record available at https://lccn.loc.gov/2019012123 For SAL, who was always our first reader CONTENTS Introduction T Talk 1 1. Multiple Ts 24 2. Ovulation 35 3. Vio lence 53 4. Power 85 5. Risk- Taking 107 6. Parenting 133 7. Athleticism 159 Conclusion The Social Molecule 202 Notes 225 Acknowl edgments 259 Index 265 TESTOSTERONE