"Boy Erased," starring Nicole Kidman, Russell Crowe and Lucas Hedges, follows the true story of a Baptist family fighting against homophobia.
"I got married very young, but it definitely was not power for me, it was protection," Kidman writes in an essay published in the latest issue of the New York magazine about women and power.
She continued: "I married out of love, but being married to an extremely powerful man prevented me from being sexually harassed, I would work, but I was still very close."
Kidman, 51, and Cruise, 56, began a whirlwind romance after meeting on the set of the "Thunder Days" of 1990. The co-stars said "I do" that year and then adopted two children together .
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The marriage of 11 years of Tom Cruise and Nicole Kidman ended in 2001. Here, the couple smiled during a photo shoot in Paris on September 2, 1999. (Photo: MICHEL EULER, Associated Press)
Their marriage came to an end more than a decade later, in 2001, but Kidman says their relationship is still difficult to discuss.
"Being married to Tom Cruise at 22 is something I always resist talking about, because now I'm married to the man who is my great love (Keith Urban), and I almost feel disrespectful," he writes. (Kidman married the country singer in 2006 and they have two daughters together.)
But, the "Big Little Lies" star says she was forced to "grow up" after parting with Cruise during her first 30 years.
"Of course I've had moments #MeToo," he reveals. "Do I want to expose them in an article? No. Do they go out in my work? Absolutely."
Kidman continued: "I'm open and raw, I want to take advantage of my experience and emotion, and I'm not only talking about sexual harassment, I'm talking about loss, death, the whole range of life, but it has to be for the right people so that go back to abuse. "
Related: Watch Nicole Kidman come to the rescue of a tarantula in a hilarious Instagram video
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