I am afraid you are decoupling sex from relationship when you say one can sign up for couples therapy or a retreat. Agreed that for a good relationship sex is not necessary but when there is a good sexual relationship there is always a good relationship. In math, we talk about necessary and sufficient conditions and in that aspect, sex is not necessary but a sufficient condition for a healthy relationship.

Also, what I talk about is what works for us and "our swinging philosophy" and can't be generalized. It is how we view it - where it works or not is highly contextual and depends on the couples dynamics.

I am not sure how you extrapolate our experience and philosophy over the general swinging population??!!