The 42-year-old star revealed his views on marriage in an article on "fifteen things I think everyone should know" in Esquire magazine.
He explains, "Angie and I will consider tying the knot when everyone else in the country who wants to be married is legally able."
Pitt also claims he "cannot image life" without his adopted children, MADDOX, five and ZAHARA, one.
He says, "They're as much of my blood as any natural born, and I'm theirs.
"That's all I can say about it. I can't live without them. So: Anyone considering (adoption), that's my vote."
Pitt and Jolie's third child, SHILOH, was born in May (06) and he says he subscribes to a laid-back parenting style.
He adds, "I try not to stifle them in any way. If it's not hurting anyone, I want them to be able to explore.
"Sometimes that means they're quite rambunctious!"