Butt Seriously by Evan Goldstein

Butt Seriously: The Definitive Guide to Anal Health, Pleasure and Everything In Between
 
Butt Seriously is a guide to all things anal. Covering toys, training exercises, sex positions and offering helpful advice for when things go wrong, this book is designed to answer all of those questions you may have felt too embarrassed to ask before. Having had a lifetime of personal and professional experience, Dr Evan Goldstein has put together all the medically accurate, scientifically-backed information you need to get your peach healthy and maximise your pleasure, whilst busting the myths around anal sex that are holding you back.
 
Refreshingly inclusive and sex-positive, Butt Seriously is the bum bible for anyone looking to uplevel their sex life and open the (back)door to new possibilities!
 
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'By far the most thorough manual on anal sex'  - Zachary Zane, author of Boyslut: A Memoir and Manifesto