There is a lot of different information out there regarding romantic compatibility between types. Among others, I know of the following theories of perfect matches:

- Opposites attract (INTJ + ESFP, ISTP + ENFJ etc.)

- Keirsey: Opposites attract, but N or S must be the same (INTJ + ENFP, ISTP + ESFJ etc.)

- Personalitypage: The dominant function must be shared, but oppositely directed (INTJ with Introverted Intuition + ENFP _or_ ENTP since both have Extraverted Intuition, ISTP with Introverted Thinking + ESTJ _or_ ENTJ since both have Extraverted Thinking)

Based on my own observations, I believe that Keirsey has it right when he insists that N or S should be the same. I also believe that Personalitypage is correct in emphasizing the importance of having the same dominant function. Finally, I believe that, as long as the basic language (N or S) and interest (dominant function) are the same, opposites do indeed attract and complement one another.

I therefore propose the following hierarchy of relationship matches:

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Condition 1: The dominant function must be the same, but oppositely directed.
Condition 2: The perceiving function (N or S) must be the same.

If possible once these conditions are met, the judging function (T or F) should be different.

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This leads to the following eight optimal matches:

INTJ-ENFP (Dominant function: Intuition, T and F opposite)
ENTP-INFJ (Dominant function: Intuition, T and F opposite)
ISTJ-ESFP (Dominant function: Sensing, T and F opposite)
ESTP-ISFJ (Dominant function: Sensing, T and F opposite)
INTP-ENTJ (Dominant function: Thinking)
ISTP-ESTJ (Dominant function: Thinking)
ENFJ-INFP (Dominant function: Feeling)
ESFJ-ISFP (Dominant function: Feeling)

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I'd love to hear any thoughtful comments.

Also, if anyone is aware of a source who has already published this hierarchy, please let me know.