I respecfully disagree. I think the 4th function is something that causes flat-out neurosis and this evil, very dark emotion that we were born inherently wrong and defected in some way. And no matter what we do we can't get rid of it. It makes you feel like God doesn't love you, and like there's these little worms feasting off your heart and spitting on your face just because they can. Problem is therefore, that we want to deal with it *too* much.4th: This is something we don't feel we can deal with, and furthermore generally don't feel we should have to.
Your dual is your dual because when you're with them, they go out of their way to show you that in their eyes, it's not a weakness- it's no big deal. They constantly reassure you, like a mother cooing a child. (Eh this might be on the verse of condescenion but you know what I mean) They protect your polr, but in a very natural, humane way so it doesn't come across as patronizing. (And let's face it, even saying things like "Humans are here to help each other grow" is patronizing.) But that's what it is, it's just kind of unspoken and erotic.
They don't try to change it, but they accept it. The vulnerability is part of the reason why they're turned on by you, too.