one of my best friends (male 7w6 sx/so entp is dating a 9w1 infp sp/sx female). i can't really speak for the reverse tho.
to me entps in particular help me with my story, with falsification, improve my sense of self-efficacy and confidence, and as an infj, are the most naturally compelling for me to just wander through and take turns exploring and unpacking each other's ideas. i think all N types like possibilities, but entps seem pretty good at managing them and organizing them somewhat precisely. their abilities to control the world around them is both impressive and, when shared, are a great fucking skill to offer in relationships. i don't know what your enneagrams are, but everyone likes ep 7s flow and energy. for 4 types, it's a particular boon because the accepting, harmonizing energy and enthusiasm is just refreshing and helps improve emotional circulation.
from the perspective of the nf male, and this is just what i'm learning, once we get over assuming we need nurturance and build healthy places/systems for ourselves that maintain our own sense of well-being, we learn that WE are supposed to be the capable initiators of intimacy in relationships. if he's gotten over his own gender conflicts and found solutions to assert a healthy self that runs somewhat against the grain of social expectation, then it just doesn't matter any more. and our increased openness to a much wider range of romantic and relational possibilities reflects the increased acceptance of and confidence in ourselves.