How the letters interact with each other is what we call type dynamics.
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However, the most common view is that couples are more likely to have similar preferences than opposite preferences.
It’s your go-to when you need to solve a problem, and the most conscious of all the functions. Extraversion and Introversion are more than just a preference.
Careers, best/ideal match, compatibility in relationships, personal growth.
Fe also conveys an air of warmth and friendliness, giving the impression that ITPs are, at least to some extent, emotionally open.
That being said, we must also acknowledge that Fe happens to be ITPs’ inferior function, which, among other things, can result in dramatic swings between friendliness (Fe) and aloofness (Ti). Since ITPs both use Ti and Fe, we must examine their respective auxiliary functions to understand how the INTP and ISTP might differ in relationships. In combination with Ti, it often contributes to high levels of kinesthetic and/or practical intelligence in ISTPs, allowing them to function adeptly as athletes, craftsmen, mechanics, surgeons, business persons, etc.