Opposites attract even when they shouldn't, and your dual is gonna seem stale and boring at first. But the dual is gonna surprise and amaze you, and the pure opposite is just gonna repel you...but you usually have to experience it first.
It's really very true how people say we ignore our duals in groups for so long, while we seem to just...click with our conflictors at first. That's how it's been like for me, and part of the reason why socionics seemed to make so much sense.
Many first marriages are with your conflictors, because there's an unmistakable opposite energy that cannot be denied. But it's like a magnet that's poisonous. That's the best analogy I can think of. You're drawn to your conflictor, but not for good reasons.
Now granted, conflicting relationships aren't the uber most-bad thing...though they are not good for you, and you just have to learn that yourself. Conflicting can be energetic if you're not close- but over-time we want to be close with people, so that kind of contradicts itself.
The best relationships are the perfect blend of hetero and homo-ness ...ie duals, read my psychology-gay thread "the true nature on why we like this crap." It's where you can just be your total self, not worrying about the illusion of gender either way (or in any way) It is very powerful indeed.
Just look at how many fucking bugs go fly right up to the fucking lamp even when it's going to fucking kill them. That's kind of like how conflicting relationships are.

