I've certainly seen myself and others "move" to those specific instincts when trying to look for a partner.

For instance, a lot of SX first people, when online, are on social media and specific groups, or they join other groups in "real life", like at church etc. They go out to meet people.

I've been wondering whether people have different stackings (temporarily) when looking for a mate. As in So/Sx would become Sp/So when looking for a partner; they would value things an Sp/So would value, when looking for a mate. I can say this is indeed what I have noticed with myself. I am putting a lot of stock into someone's (financial) security. Also, my So/Sx mother has married my Sp/So dad, and the "movement of the stacking" might partly explain why she found him attractive. Then, I know of an Sp/Sx girl who is with an Sx/So boyfriend. Those pairings correlate nicely with both the flow theory, and the pair bonding theory.