What is it with couples where the man is in a relationship with the female version of himself, and vice versa?

You can see that they share similar personalities, especially in their sense of humor and their tendency to post videos and pictures of themselves. Like posting the same kind of content or captions in the same way.
It's almost like they're the same person.

I'm just curious because I've noticed this in some couples, though not all. I don't mean to offend anyone. I just want to know if others see it too and if it's normal.

Is this kind of similarity attractive to men or women? Do they eventually start copying each other's behavior and humor, especially around a shared passion or hobby? Or is it that they want to show they understand and appreciate each other's interests?
What is it with couples where the man is in a relationship with the female version of himself, and vice versa?
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