"I think one of the life changing things that he did, one of many, is that I was absolutely never going to get pregnant. I never felt that it was the right thing to do," Jolie, 33, tells W magazine, in an article featuring photos taken by Pitt of her breastfeeding.
But when she saw Pitt, 44, with adopted children Maddox and Zahara, "I knew that he would never see them as different, and that gave me a certain peace," Jolie says.
"I suppose I just looked at him and loved him and just felt open to (getting pregnant)," she says. "I suddenly wanted to. It's one of those things you can't explain."
Now, after having three children with Pitt, including 3-month-old twins Knox and Vivienne and 2-year-old Shiloh, "I wouldn't trade that experience for the world," says Jolie. "It taught me a lot about life, just the process of it, and now we have three other beautiful children that wouldn't otherwise be here."
In the intimate W magazine pictures taken by Pitt just weeks after the twins' birth, Jolie bares her body – quite comfortably, she says.
"I'm with a man who's evolved enough to look at my body and see it as more beautiful, because of the journey it has taken and what it has created," she says. "He genuinely sees it that way. So I genuinely feel even sexier."
Jolie says she has "a lot of respect" for Pitt, who helps her "to be better and fight hard for the things that I love."
"I do think that I'm in a good partnership now," she says. "I think it just needed to be the right man."