Let's see how intertype relations work in the EM subtype system:
For the DCNH system Gulenko claims that "subtype duality" is the best relation:
Dominant with Normalizing: ---
Harmonizing with Creative: ---
For the IE subtype system it is quite obvious how it works theoretically:
Leader with Conscience: ---
Motivator with Coordinator: ---
Innovator with Decorator: ---
Contactor with Expert: ---
Just like in classical socionics where -base is -dual-seekig and so on...
I definitely know that I am an Expert Analyst (Ni-INTj) and that I find Contacting Enthusiasts (Se-ESFj) most attractive of all 128 types. Evolutionary psychologically it is clear that the perfect match must be the most atractive person - evolution didn't make mistakes there I think...
Some people don't need socionics because they just choose the most attractive partner which is naturally a good choice. But some months ago I didn't even know which type of woman I find most attractive. Socionics helps a lot to find out what kinds of humans even exist...
Note that perfect matches have the same facial structure: Both Ni-INTj and Se-ESFj have a face which I call a "thin oval".
That is something I do not believe until I see it.