The Ethical Slut - Definition and Overview

The Ethical Slut: A Guide to Infinite Sexual Possibilities (ISBN 1890159018) is a book about the practical aspects of polyamory. It was first published in 1997 by Greenery Press.

Written by Dossie Easton and Catherine A. Liszt, it discusses how to live an active life with multiple concurrent sexual relationships in a fair and honest way, how to deal with the practical difficulties and opportunities in finding and keeping partners, maintaining relationships with others and strategies for personal growth. According to their principles, "a slut is a person of any gender who has the courage to lead life according to the radical proposition that sex is nice and pleasure is good for you."

Where many polyamorists consider Heinlein's Stranger in a Strange Land to be the book that started a movement for open relationships, The Ethical Slut has often been considered as 'the' guidebook to putting it into practice.