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“The Virility Paradox by Charles Ryan, MD, is a marvelous, timely and fun book about testosterone and behavior in men and women. This is a must read for parents, teachers, doctors, psychologists and everyone interested in gender.”

—Louann Brizendine MD, neuropsychiatrist, author of The Female Brain and The Male Brain

“Charles Ryan has written a unique, easy to read medical commentary on the paradoxes of testosterone. Anyone wanting to learn about the scientific basis of puberty, crime, behavior or prostate cancer will want to read this fascinating book written by one of our nation’s most outstanding academic physicians.”

—Stanley Prusiner, MD, director of the Institute for Neurodegenerative Diseases at University of California, San Francisco, Nobel Laureate in Medicine, and author of Madness and Memory

“Fascinating! Ryan is a doctor and professor but also a natural scientist . . . The Virility Paradox is a book of remarkable scope, for this hormone plays a role in every human drama—in sickness and health and in aging; in sex and power; morality and politics; in how we think and how we behave. With unforgettable stories to complement his extensive scientific research, Ryan has us not only rethinking all our ideas about masculinity but what it is to be human.”

—Jena Pincott, author of Do Chocolate Lovers Have Sweeter Babies: The Surprising Science of Pregnancy and Do Gentlemen Really Prefer Blondes?: The Science of Love, Sex, and Attraction

“A terrific read. Dr. Ryan writes with grace, wit, and insight on a topic that touches on nearly every aspect of our society. Highly recommended.”

—Dr. Kelly Parsons, author of Doing Harm and Under the Knife and Professor of Urology at the University of California, San Diego
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