As beguiling and powerful as Jane Fonda is onscreen, she's yet to play a role that's a match for her whiplash-inducing life of artistry, celebrity and polarising activism. Then there's the personal drama, including serial marriages to three very different husbands with their own fame.

When the 80-year-old Fonda decided to participate in a documentary about her - "Why not? I don't know how much longer I'm gonna live" - it was with award-winning film-maker Susan Lacy, who made an intriguing choice: using the men in Fonda's life as the organising principle for Jane Fonda in Five Acts.

The film devotes its first chapter to Fonda's fraught bond with her emotionally reserved dad, the acclaimed actor Henry Fonda. It was at the end of his life that she managed to draw him closer: They starred opposite each other as an estranged father and daughter in the film On Golden Pond.

The 1982 Academy Award ceremony at which Henry won his only Oscar is what Jane Fonda readily points to when asked to name a Hollywood career highlight. Her father died four months later.

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"The fact that it was with this movie, and he asked me to receive [the award] if he won," Fonda said in an interview, her steady, blue-eyed gaze reminiscent of her father. "It's rare that a child gets a chance to do something like this for a parent with whom they have had such a complicated relationship."

Five Acts moves on to the husbands: French film director Roger Vadim (of the Barbarella sex-kitten years), activist Tom Hayden (a match for her growing political fervour) and media mogul Ted Turner (so magnetic that she tried semi-retirement, until she didn't.)

She recalls the thrill of sexual "electricity" with all three partners, but felt compelled only by pregnancy to marry Vadim (they had a daughter, Vanessa) and Hayden (a son, Troy). She wed Turner in 1991, she said, because he insisted living together was setting a bad example for his grown children.

"But I think it's really because he's insecure. I mean, men want to get married," Fonda said. "I had two important relationships subsequent to Ted, they wanted to get married. They were obsessed with it, because it's possession."

Asked about future relationships minus marriage, Fonda has a concise answer: "I've closed up shop."

The film's last act belongs to Fonda alone, unbound by marriage and focused on passions including voting rights and other political causes as well as work, which includes Netflix's Grace and Frankie and a planned remake of the 1980 hit film 9 to 5.

Lacy said her approach struck some in her circle, especially younger women, as anti-feminist. She defends it as reflecting Fonda's 2005 autobiography, My Life So Far, and Fonda concurs.

"Before I started writing my memoir, I knew that what I was writing was a gender journey. It was a journey defined by my gender. And so it was important for me to explain why that was true," she said.

Fonda's voice is strong throughout the film, which draws on 20-plus hours of interviews in which she addresses moments as intimate as the childhood loss of her mother to suicide.

While there was no epiphany for her in watching the film, with which she co-operated but didn't control, it was rewarding, Fonda said.

"It just brought home very vividly to me what a full, rich life I've had, and varied. I mean, there's been a lot of change and a lot of controversy and a lot of survival," she said.

Her accomplishments, including a fitness empire that made her a 1980s video star, were irrelevant to critics of her protests against the Vietnam War - especially after Fonda was photographed perched on an anti-aircraft gun during a 1972 wartime visit to North Vietnam.

She recently said that moment sent a "horrible" message to soldiers and their families.

"I'm proud of most of what I did, but very sorry for some of what I did," she says in the film, referring to that period.

Her involvement resulted from a chance wartime meeting with US soldiers in Paris which shook her belief that America always fought on "the side of the angels", she said.

But discovering her calling as an activist also was a profound personal moment.

"I had a child, I was in a marriage. But I felt lost and empty. And when these soldiers opened my mind ... I was like dry brush and they were this match and, whoosh!"

- AP