On Thursday, Mr. Strauss-Kahn broke a long silence to acknowledge that perhaps his double life as an unrestrained libertine was a little outré.

“I long thought that I could lead my life as I wanted,” he said in an interview with the French magazine Le Point. “And that includes free behavior between consenting adults. There are numerous parties that exist like this in Paris, and you would be surprised to encounter certain people. I was naïve.”

“I was too out of step with French society,” he added. “I was wrong.”

But whether his downfall will have a lasting impact on the culture of sexual privilege and impunity for powerful men in France remains uncertain. He declined to be interviewed for this article.

This month Mr. Strauss-Kahn won a major legal battle after a French prosecutor dropped part of the investigation into an alleged sexual assault at a hotel in Washington. A Belgian prostitute recanted her earlier accusation, saying the encounter was just rough sex play, but Mr. Strauss-Khan is still a suspect for involvement in a prostitution ring.

Buoyed by that first victory, Mr. Strauss-Kahn’s lawyers predict he will triumph in France, where having sex with prostitutes is not illegal, although soliciting and pimping are.

In essence, they argue, there is nothing criminal about the sexual life of a libertine, according to Mr. Strauss-Kahn’s lead lawyer, Henri Leclerc.

That defense may not satisfy the charges in a New York civil lawsuit filed by Nafissatou Diallo, who accused Mr. Strauss-Kahn of sexual assault last year in a New York hotel where she was a chambermaid. Lawyers representing both sides deny there are financial negotiations under way.

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“His travels will eventually bring him to a courthouse in the Bronx, where he will face justice,” Kenneth Thompson, the lawyer representing Ms. Diallo, said in an interview.

All of Mr. Strauss-Kahn’s current legal woes in New York and France mixed together last year, with devastating results.

Mr. Strauss-Kahn’s name first surfaced in the French inquiry by chance, in May 2011. French investigators were tapping the telephones of Dominique Alderweireld, an owner of Belgian sex clubs who is also a suspect in the prostitution ring.

In one conversation between Mr. Alderweireld and a longtime childhood friend, René Kojfer, who worked at the Carlton Hotel in Lille, the men were gossiping about Mr. Strauss-Kahn’s recent New York arrest, according to lawyers involved in the case.

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They then recalled a freewheeling luncheon in 2009 at a Paris restaurant called L’Aventure, and Mr. Kojfer discussed whether they could make money by offering information about that day to Ms. Diallo’s lawyer, Mr. Thompson, who was never called, the lawyers said.

At L’Aventure, Mr. Strauss-Kahn and a few friends gathered in a private basement club, carpeted in purple and black tiger stripes, with a female Belgian escort and Mr. Alderweireld’s companion, Béatrice Legrain, who recalled that lunch in an interview.

She said that Mr. Strauss-Kahn, energized by Viagra, had sex with the escort and then followed Ms. Legrain to the bathroom, grabbing her and demanding sex. But she said she rebuffed him and it “wasn’t a big deal.” Mr. Strauss-Kahn’s lawyer declined to comment.

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In his own interview, Mr. Alderweireld made light of the “petit” episode at L’Aventure. His lawyer, Sorin Margulis, took a more scornful view: “It’s more an act of Louis XIV.”

The investigation into the prostitution ring in Lille ultimately swept up 10 suspects, including Mr. Strauss-Kahn. They knew each other largely through their membership as French Freemasons, according to Karl Vandamme, a defense lawyer who represents Fabrice Paszkowski, the owner of a medical supply company who played a crucial role in organizing the sex parties.

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“Libertines are people like you and me: people who have a normal life,” said Mr. Vandamme, who said his client invested around $65,000 in party expenses, betting on the political rise of Mr. Strauss-Kahn.

The banker, he said, would typically arrive late for the more than a dozen parties, held over a period of about five years. There was a rhythm to the gatherings, with everyone dressed for a sit-down dinner, he said. Then over time, couples separated, “kisses were exchanged between one woman and another and between a husband and the wife of a friend” until the guests “all ended up nude.”

Hubert Delarue, the lawyer for Mr. Kojfer, also accused of involvement in the prostitution ring, predicted that most of the suspects would be cleared. Mr. Strauss-Kahn’s lawyers argue that he was unaware that some of the women were prostitutes because they were all naked by the time he arrived late, and the party hosts contend they reaped no profits.

“Prostitution was more regulated before,” Mr. Delarue said, “but it was for a certain type of population. Today among all those women, there are occasional prostitutes, and sometimes they’re top models who try to make ends meet. They aren’t miserable women on the sidewalk.”

Mr. Strauss-Kahn’s double life is not surprising to some Parisians.

“He’s not the only libertine man in the political world,” said Olivia Cattan, who leads an anti-sexism association called Words of Women and believes the case reflects a code of silence. “It is linked to power, and women are often complicit when it can guarantee them a job.”

While Mr. Strauss-Kahn awaits the outcome of his legal cases, he is shaping a new role for himself after being disowned by his Socialist party.

In the last two months he registered Parnasse, a consulting firm named for the Left Bank neighborhood of Montparnasse, where he moved after separating from his wife, Anne Sinclair, in August.

He has delivered lectures in South Korea, Morocco, England and Ukraine, offering a euro zone rescue plan for wealthy countries to share some gains from favorable interest rate spreads with poorer nations.

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“He’s a man of incredible moral strength,” said Michel Taubmann, his biographer. “I saw this man resisting, avoiding a fall. Never have I have seen him desperate. He knows he is innocent and wants to move forward.”

Mr. Strauss-Kahn has pleaded publicly for the media to “leave me in peace,” but he cannot escape his notoriety.

In the works is a French play, “Suite 2806” — inspired by the episode in the New York hotel room with the housekeeper — and, separately, a movie directed by Abel Ferrara with Gérard Depardieu.

And in a tribute to the whole affair, two French entrepreneurs are promoting a saffron-flavored soda to mix for cocktails at fashionable Paris bars. They are branding it as an aphrodisiac with a memorable label: Mr. Strauss-Kahn’s initials, DSK.