Have you noticed duality to be more common between some types?

[Rebelondeck]

....... If you grew up with your dual then you might be more conscious/aware when you meet them...... My dad is my supervisor and as a result, I’m really familiar with LSI and I noticed I encounter a lot of them irl and online.

I've met more than a few heterosexual couples where one of them has a similar personality to the other's parent of the same sex. I would propose that this is a more common scenario than duality.

a.k.a. I/O