If we are talking relationships I think whether monogamous or non-monogamous the best relationships are ones where no one feels pressured and everyone involved is free to end the relationship at any point but no one wants to because everyone (whether two or more people, open or closed relationship) loves being in the relationship too much.
Trust plus mutual appreciation minus the pressure is nice when it happens I am sure
Trust plus mutual appreciation minus the pressure is nice when it happens I am sure
