You and your partner have been talking about opening your relationship and you want to make sure you do it in the healthiest way possible that's going to give you the best chance of success; 

You've had a negative experience of ethical non-monogamy in the past, but you want to try it again so you need to know where things went wrong; 

You want to learn about ethical non-monogamy to better understand people you love who are in a non-traditional relationship