Welp, I definitely relate to sexual moving to social when alone/looking.

I have also dated long term an sp/sx and so/sx and honestly, our major issues were probably Enneagram related more than Socionics!

They both were very intense sx like me initially, then both returned to their respective first instincts and I got pretty frustrated with that over time. The sp/sx would just want to relax in his comfortable environment, do random chill things and essentially be a homebody in a sense.. whereas I eventually got very depressed about not relating to the outside world and him not joining me in more exciting activities. The so/sx would be TOO social for me, (lol) .. he placed sooo much importance on his friends & family, always wanted me to join in on his family events and such.. I more often wanted to just be with him and not deal with people I really didn't even like that much anyway..

In both situations we broke up because of this, really.. wow, this is like sort of an epiphany for me. I didn't realize how much instinctual values are important for relationships.. The first was too "boring" for me.. (yikes) and I was too demanding, too needy of stimulation. The second was too concerned w/ popularity, other connections, and I got jealous/paranoid/insecure. Yep.

In the end though, I think sp/sx was a better fit for me. I could handle someone being very introverted and such, more than I could handle having to "compete" for someone's attention and thinking they are giving it equally to everyone else