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The Definitive Guide for Talking about the P Word

Launching on 


This easy-to-understand manual gives readers an overview of how and why penises work. Weaving together surprising insights and instructive illustrations about humans and other mammals, this frank and fun book is the ultimate guide to having a penis and keeping it healthy.

The P Word provides the tools kids need to recognize and name their body parts, understand when something might be wrong, and practice good hygiene. As an animal expert, Dr. Hu includes fascinating mammal facts and comparisons to help kids understand that the penis is a natural, normal, and wildly diverse body part.


Refreshingly gender-neutral and inclusive, The P Word is a resource that takes the stress away from parents needing to have all the answers, while openly addressing the curiosity of kids. 

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The P Word

A Manual for Mammals


Ages 7-12 • Grades 2-6

7 x 10" • 56 pages

Hardcover ($18.95):


eBook ($13.99):


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Praise for The P Word: A Manual for Mammals

“A delightfully candid book! The P Word guides kids and their parents to a
healthier understanding of their bodies.”

—Nicholas M. Caruso, Ph.D., New York Times Bestselling Coauthor of Does It Fart?


“Finally, a factually fascinating, completely charming book about one particular body
part that deserves normalized scientific conversation.”

—Cara Natterson, M.D., New York Times Bestselling Author of Guy Stuff and

The Care and Keeping of You

“I wish this book had been available earlier in my teaching career.”

—Alexandra Roosenburg, M.T., M.Ed., Founder and Director Capitol Learning Academy, Washington, D.C.


The P Word should be required reading for all 10-year-olds and many adults!”

—Don E. Wilson, Ph.D., Curator Emeritus of Mammals,
  National Museum of Natural History, Washington D.C. 


“As a pediatrician, I know the importance of sharing accurate and appropriate resources … I highly recommend this refreshingly honest and engaging book!”

—Jennifer A.F. Tender, M.D., Pediatrician


“A unique and fascinating book! Parents will learn along with their children as they read this wonderfully informative book together.”

—A. Heather He. Halperin, M.S.W., L.C.S.W., Retired Faculty USC Suzanne Dworak-Peck School of Social Work, Los Angeles, CA


“This book will inspire kids—before, during, and after puberty—to be comfortable in their own skin!”

—John Santelli, M.D., M.P.H., Population and Family Health and Pediatrics Mailman School of Public Health, Columbia University

“Professor David L. Hu, a great scientist, makes this book about a world famous body part both fun and informative.”

—Marc Abrahams, Founder, The Ig Nobel Prizes
  Editor and Co-founder, Annals of Improbable Research, Cambridge, MA 


“Hu has managed the near-impossible: creating a family-friendly picture book that engages and informs audiences of all ages.”

—Jacob M. Appel, M.D., Associate Professor of Psychiatry  Icahn School of Medicine

The P Word … will help young people learn to take care of themselves as they grow and develop.”

—Nicole Cushman, M.P.H., Sexual Health Educator, New York, NY


“This candid book answers any questions kids may have about their penis—without them even having to ask!”

—Frank E. Fish, Ph.D., Recipient, 2022 Ig Nobel Prize in Physics, Professor of Biology, West Chester University, PA


“Brilliant! My 9-year-old boy was fascinated and I even learned a thing or two as well.”

—Academics’ Choice Awards Reviewer

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About the Author and Illustrator

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Author and Illustrator.jpg

Dr. David L. Hu is a mechanical engineer who studies the interactions of animals with water. He has discovered how dogs shake dry, how insects walk on water, and how eyelashes protect the eyes from drying. During his career, he's won the Ig Nobel Prize in Physics, the National Science Foundation CAREER Award, and the Pineapple Science Prize. Dr. Hu’s research has been featured in The Economist, The New York Times, Saturday Night Live, Science Friday, and Highlights for Children.

He is the author of the young adult nonfiction book How to Walk on Water and Climb Up Walls. A professor at Georgia Institute of Technology, Dr. Hu lives with his wife and two children in Atlanta, Georgia.

Ilias Arahovitis was born in South Africa and was raised in Athens, Greece. In his early years, Ilias's canvas was the floor and walls, but after the age of five, he started using actual canvas to create his first oil paintings. Ilias graduated from AKTO Art & Design College in Athens, and now specializes in children's books, having illustrated numerous books in the last 25 years.

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