I disagree on the compatibility list. My sei SO identifies as sp/so, with sx last. Though he has the desire to merge with his partner, he doesn't feel the passion and drive of the sx. But he's the one who keeps an eye on the social realm and where we fit into it. So every once in a while he prompts me to contact someone, or says he wants us to go to one of the meets. But he's shy and seems closed off to those who don't know him. So it's left up to me, the extrovert, to initiate conversations etc.

Also, he leaves it up to me to guide our direction in terms of household interests/pursuits. And now that my adult daughter is in her home living her own life, his and my interests/pursuits are beginning to align.

I guess, basically, in terms of compatibility, my sx first covers for his sx last, and his so first covers for my so last.