According to Wikipedia (regarding socionics and cognitive functions) Se attributes aggressive and territorial traits.
I have noticed some serious aggression and territorial-ism in my personality...although as a child these traits were definitely not present. I wonder if childhood Se-users, while recollecting, would use the words "aggressive and territorial" to describe themselves.
Also, I work with mostly Si users. None of the Si users ever appear aggressive or territorial, unless they are at the end of their rope. They seem to prefer not to use such behaviors, and begin to look sometimes terrified, sometimes in awe when I do. I am still learning to use such behaviors appropriately; I believe they can be appropriate and used in a manner which allows all parties to leave with self-respect.
I am interested in what others think about the presence of aggression and territorial-ism in their own personality traits.
"Se is responsible for the perception, control, defense, and acquisition of space, territory, and control. It observes outward appearances, estimates whether forces are in alignment or conflict, and uses strength of will and power-based methods to achieve purposes. Se understands territory and physical aggression." -Wikipedia, "Socionics", Information Elements
The description of Si is rather interesting too.