BORN this way.

That has long been one of the rallying cries of a movement, and sometimes the gist of its argument. Across decades of widespread ostracism, followed by years of patchwork acceptance and, most recently, moments of heady triumph, gay people invoked that phrase to explain why homophobia was unwarranted and discrimination senseless.

Lady Gaga even spun an anthem from it.

But is it the right mantra to cling to? The best tack to take?

Not for the actress Cynthia Nixon, 45, whose comments in The New York Times Magazine last Sunday raised those very questions.

For 15 years, until 2003, she was in a relationship with a man. They had two children together. She then formed a new family with a woman, to whom she’s engaged. And she told The Times’s Alex Witchel that homosexuality for her “is a choice.”

“For many people it’s not,” she conceded, but added that they “don’t get to define my gayness for me.”