People also tend to enjoy partners who provide their 4th or 5th slot.
You need your 4th slot function for the sake of your dominant function, unfortunately, you are kind of shitty at it. Thus, you try and get others to provide it for you, like a partner!
Two people using the same dominant function are sure to cross swords, but your 5th slot is a function that never clashes with your dominant. In fact, you quite like people who use a lot of it (like a partner!), and dislike those devoid of it.
- INTJ+ENFP (mutual Ni-Ne 5th slot bond)
- INFJ+ENTP (mutual Ni-Ne 5th slot bond)
- ISTJ+ESFP (mutual Si-Se 5th slot bond)
- ISFJ+ESTP (mutual Si-Se 5th slot bond)
- INTP+ENFJ (mutual Ti-Fe 4th slot bond)
- ISTP+ESFJ (mutual Ti-Fe 4th slot bond)
- ISFP+ESTJ (mutual Fi-Te 4th slot bond)
- INFP+ENTJ (mutual Fi-Te 4th slot bond)
Edit: Be not bamboozled by MBTI's J and P letters; the intuitive and sensing functions are perceiving, and the thinking and feeling functions are judging. We can see that the ideal partners of each type bond over either different types of intuition or sensing in the 5th slot. These are perceiving bonds. The 4th slot bonders do such with Ti-Fe or Fi-Te, which are all judging functions. So here's another good bullet point.
- you most likely want a judging partner if you are a judger, and a perceiving one if you are a perceiver.