I prefer SSC I think because it fits better with a lurking pedantic streak I have which emerges when I am asked to consider such things.

As OS has said, in practice I doubt whether any of us stops and uses either term when we are considering a certain activity, rather we consider the ideas and principles behind the terms; which means they are for use in more general discussion only.

Both include consensual, which I believe it paramount, and I would prefer to think that we take a considered intelligent approach (i.e. sane) rather than just be aware. The aforementioned pedant has to point out that simply being aware does not necessarily indicate considered or balanced use of that awareness.

Both are functional terms though, and if I had never heard of SSC I am sure I would feel quite happy with RACK.

cariad