Because stress and ignorance can turn the anus and its functions from a source of delight into a painful disability, what's need is an owner's manual -- and here it is!
In this guide to - you guessed it! - anal pleasure and health, therapist and sexologist Jack Morin, Ph.D., gives excellent and comprehensive information and exercises to open new doors of comfort and gratification. You'll unlearn habits that can cause everything from hemorrhoids to chronic pelvic pain, and ways of achieving solo and partnered pleasure through this humblest of portals.
Everyone with a butt should have this book.