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Multiple women have come forward with allegations of inappropriate sexual behavior by funnyman Louis C.K. — including claims he masturbated in front of them or while on the phone, according to a bombshell new report.

Four women told the New York Times they witnessed or heard the comedian fondling himself, and a fifth says he asked — but she said no.

Chicago comedians Dana Min Goodman and Julia Wolov say they had just gotten their big break at the U.S. Comedy Arts Festival in Aspen, Colo. when the big-name comic asked them to hang out after the show.

But as soon as they got there, he asked them if he could take out his member. They laughed him off, thinking he was joking. He wasn’t, they said.

“He proceeded to take all of his clothes off, and get completely naked, and started masturbating,” Goodman told the Times.

“We were paralyzed.”

An unnamed woman who worked with C.K. on “The Chris Rock Show” in the ’90s says the same thing happened to her — repeatedly. She agreed at the time, but now thinks it was an abuse of power.

“I think the big piece of why I said yes was because of the culture. He abused his power,” she said.

C.K. allegedly pulled the same stunt on comic Rebecca Corry when they were both working on a TV pilot in 2005. She declined, but the show’s the show’s executive producers, Courteney Cox and David Arquette, confirmed they were aware of what happened at the time.

His fifth accuser, performer Abby Schachner, says she called C.K. to invite him to her show in 2003 — and he started telling her about his sexual fantasies while breathing heavily.

Goodman and Wolov said they told people about what C.K. did the next day — but there was immediate “backlash.” C.K.’s powerful manager, Dave Becky, later told the duo’s own manager that they should stop talking about the incident, they say.

Rumors about the titular star of “Louie” have circulated for years.

Gawker wrote about the Goodman and Wolov incident in a 2012 blind item and in 2015 alleged he’d done the same thing to two other women at the Just For Laughs comedy festival in Montreal.

Last year, Roseanne Barr told The Daily Beast: “It’s Louis C.K., locking the door and masturbating in front of women comics and writers. I can’t tell you — I’ve heard so many stories.”

Comedian Tig Notaro earlier this year distanced herself from C.K., who was an executive producer on her TV show, saying cryptically that he needed to “handle” the allegations against him.

She now tells the Times that she knows many of his “victims.”

“Sadly, I’ve come to learn that Louis C.K.’s victims are not only real, but many are actual friends of mine within the comedy community,” said Notaro.

Masturbation has been an ongoing theme in C.K.’s routines.

“Some things I’m sick of, like the constant, perverted, sexual thoughts. I’m so tired of those … It makes me into an idiot. Jacking off to morons, and ooh, look at my t-ts,” he joked in a 2011 show at the Beacon Theatre on Broadway.

In his 2008 stand-up album, “Chewed Up,” he said: “I jerk off way too much and it upsets me and I don’t know why.”

And in 2010’s “Night Out,” he called himself “the best masturbator on the planet Earth.”

“There is nobody better at that than me,” he added.

The premiere of C.K.’s upcoming film “I Love You, Daddy” was axed earlier Thursday ahead of the Times’ story, and a planned appearance on “The Late Show With Stephen Colbert” was also scrapped.

C.K’s publicist declined to comment on the allegations to the Times, but the comic has denied the allegations in the past.

“I don’t care about that,” he told Vulture last year. “That’s nothing to me. That’s not real.”