I initially self-typed sp/sx, until I learned that sx encompassed much more than sexuality, and saw the way I approached exercise and substances as a shining exemplar of it... and I'm not sure to what extent self-typing sx-primary influenced or enabled more explosive/self-destructive behaviors/lifestyles, but whatever, it's resonated since.

in general I tend to float about the periphery in anticipation (I attribute part of this to Se dual-seeking -- the impulse has to be complete or doesn't exist), and as soon as I catch wind of something remotely interesting/stimulating, I go all in. it's kind of nice, I've never really minded living in such black-and-white terms... and even though my sp is last, I can always say no or 'turn off' if I need to... impetuous absolutes, more or less.

I've also noticed that as part of this, my impulses tend to sometimes become compartmentalized. like I can have a relationship that I'm completely engrossed in, but as soon as something feels off or a variable changes, it immediately gets 'boxed in' to another reality and another pursuit/impulse (possible temporarily, possibly not) takes its place. being Ni/Se might influence this as well (its temporality tends to be a bit more 'segmented' than that of Ne/Si).