Here, I rate the "romantic satisfaction" of
all intertype relations from 0 to 10, based on anecdotal evidence and observations (of most matches of that kind; individual experiences will differ, dependent on subtypes, Enneagram, personal preferences etc). Ratings I am not as sure about will be in cursive.
Possible explanation for why the ratings differ amongst the genders in two words: gender roles. Furthermore, there have been
studies showing that extroverted women were the least happy with introverted men on average. Not surprisingly, most introverted men ended up with fellow introverts. Besides that, I have found that certain types have personal standards that their Dual may not always fulfill; for instance, NTs commonly want high logical intelligence in a mate, and EIIs commonly want a mate with a good moral sense or core.
Note: This overview only deals with heterosexual couples. I do not have enough insight into homosexual relationships to also provide an overview for their relationship dynamics. One possible way to make this overview work for you as a homosexual, is to assign the "male" part to the person who fits the male gender role better (e.g "Butch lesbian" or "Top"), and the "female" part to the person who fits the female gender role better (e.g "Lipstick lesbian" or "Bottom"). It would be appreciated if you could add your own experiences in the comments below.
0-4: Below Average
5-5.5: Average
6-7: Above Average/Good
8-10: Great
Extroverted Male with Introverted Female
Extroverted Female with Introverted Male
Introvert with Introvert
Extrovert with Extrovert
The highest ranking relationships: SEE(m)-ILI(f), SLE(m)-IEI(f), ILE(m)-SEI(f), ESI-ESI
The lowest ranking relationships: SLE(f)-EII(m), LSE(f)-IEI(m), LIE(f)-SEI(m), ILE(f)-ESI(m)
This overview does not claim that every highest ranking relationship will be great; of course both individuals need to be attracted to each other and compatible on other levels beyond Socionics in order to have a great relationship. But
all else equal, those matches tend to be the most satisfactory for the people involved and the most satisfied in comparison to the other ITR matches on average (in modern Western society).
The lowest rating I've found amongst long-term (married) couples was 4.5.