i have to say that none of what was posted by the example of the ESTP male and INFP female holds true in my experience. My friend and I both tested in MTBI but I feel the socionomics description of Dual holds true for us. I haven't taken the socionomics test. Still, I would never test as an INFJ, I'm sure. My friend and I don't engage each other's weaker vulnerable functions. We understand one another and deeply trust one another. This doesn't mean that there haven't been misunderstandings, but they have quickly been resolved, as with a Dual couple. I have a boss who is a conflictor and we can only be polite to one another. He's an ISTJ. Neither one of us can predict the actions of the other and we can only discuss superficial matters for a short period of time. My ESTP and I loved to see one another and to talk, sometimes for hours. The only distress between us came from outside influences that we had no control over. Even then we remained true to what we knew was the intention of the other: love and friendship and a romantic bond we couldn't yet talk about.