Demi Moore says Ashton Kutcher rationalized his infidelity by citing their past threesomes

The complications of Demi Moore and Ashton Kutcher's six-year marriage were much deeper than the tabloids ever knew.

In the actress' new memoir, "Inside Out," Moore candidly discusses the lengths she says she went to in order to keep her then-husband happy. When they met, Moore was 41 and Kutcher was 25. It was Kutcher, she says, who proposed the idea of a threesome.

“I wanted to show him how great and fun I could be,” Moore writes, according to Radar, adding that the two instances in which she engaged were a "mistake."

Reports of infidelity started popping up not long into their marriage, and one allegation in particular cut deep: In 2010, tabloids claimed that Kutcher, then in his early 30s, met a 21-year-old woman while at a bowling alley with Moore's daughter, Rumer Willis.

He allegedly proceeded to cheat on Moore in their shared home while she was out of town filming a movie. When Moore later confronted him, he cited their past threesomes as an excuse, she said.

"Because we had brought a third party into our relationship, Ashton said, that blurred the lines and, to some extent, justified what he’d done," Moore writes.

Moore and Kutcher ended their relationship in 2011, but he has remained on positive terms with the family. In June 2019, he and Rumer were spotted going out for drinks with friends.

"I loved those kids like my own kids," he told Howard Stern in 2015. "I helped raise them until Tallulah was 18 when we got divorced."

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Ashton Kutcher and Demi Moore together
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Ashton Kutcher and Demi Moore together
LOS ANGELES - JUNE 18: (U.S.TABS - HOLLYWOOD REPORTER OUT) Actress Demi Moore and Ashton Kutcher arrive at the after-party for 'Charlie's Angels: Full Throttle' at the Chinese Theater on June 18, 2003 in Los Angeles, Californis. (Photo by Kevin Winter/Getty Images)
Bruce Willis, Ashton Kutcher and Demi Moore with daughters at the Mann's Chinese Theatre in Hollywood, California (Photo by Lester Cohen/WireImage)
Ashton Kutcher and Demi Moore (Photo by Dimitrios Kambouris/WireImage for Bragman Nyman Cafarelli)
Ashton Kutcher and Demi Moore during 4th Annual 'ten' Fashion Show Presented By General Motors - Red Carpet in Los Angeles, California, United States. (Photo by Dimitrios Kambouris/WireImage for Bragman Nyman Cafarelli)
Ashton Kutcher and Demi Moore at the Geisha House in Hollywood, California (Photo by Lester Cohen/WireImage)
Ashton Kutcher, Demi Moore, Glenda Bailey and Victoria Beckham (Photo by Dimitrios Kambouris/WireImage for Marc Jacobs)
Ashton Kutcher and Demi Moore during Olympus Fashion Week Spring 2007 - Marc Jacobs - Front Row and Backstage at New York State Armory in New York City, New York, United States. (Photo by Dimitrios Kambouris/WireImage for Marc Jacobs)
Ashton Kutcher and Demi Moore during Ashton Kutcher and Demi Moore Sighting in New York City - September 12, 2006 at Streets of Manhattan in New York City, New York, United States. (Photo by James Devaney/WireImage)
Ashton Kutcher and Demi Moore at the Roy Thompson Hall in Toronto, Canada. (Photo by Jeff Vespa/WireImage)
Demi Moore and Ashton Kutcher arrive at The Hollywood Film Festival 10th annual Hollywood Awards, held at the Beverly Hilton Hotel. (Photo by Frank Trapper/Corbis via Getty Images)
Ashton Kutcher and Demi Moore during AFI Fest 2006 Black Tie Opening Night Gala and US Premiere of Emilio Estevez's 'Bobby' - Arrivals in Los Angeles, California, United States. (Photo by SGranitz/WireImage)
Penelope Cruz, Demi Moore and Ashton Kutcher during 6th Annual GM Ten - Front Row in Los Angeles, California, United States. (Photo by John Shearer/WireImage)
Ashton Kutcher and Demi Moore during 'Mr. Brooks' Los Angeles Premiere - Arrivals at Grauman's Chinese Theatre in Hollywood, California, United States. (Photo by Gregg DeGuire/WireImage)
Executive Producer Adam Rosenfelt, Ashton Kutcher, Demi Moore, Executive Producer Sam Nazarian and Tallulah Belle Willis (Photo by E. Charbonneau/WireImage for MGM)
NEW YORK - SEPTEMBER 08: Actor Ashton Kutcher and Actress Demi Moore attend the Diesel Spring 2008 Fashion Show during Mercedes-Benz Fashion Week Spring 2008 in New York City (Photo by John Parra/WireImage)
NEW YORK - SEPTEMBER 08: Demi Moore and Ashton Kutcher sighting in New York City on September 8, 2007. (Photo by James Devaney/WireImage)
NEW YORK CITY, NY - SEPTEMBER 8: (L-R) Ashton Kutcher, Demi Moore and Front Row attend DIESEL Spring 2008 Collection at The Promenade on September 8, 2007 in New York City. (Photo by DAVID X PRUTTING/Patrick McMullan via Getty Images)
LOS ANGELES, CA - AUGUST 20: Ashton Kutcher and Demi Moore arrives at Sony Pictures' Premiere of 'House Bunny' at the Mann Village Theatre on August 14, 2008 in Los Angeles, California. (Photo by Steve Granitz/WireImage)
WASHINGTON - JANUARY 19: Ashton Kutcher and Demi Moore attend Entertainment Industry Foundation and ServiceNation 'A New Era of Service' Breakfast at Ballou Senior High School on January 19, 2009 in Washington, DC. (Photo by Kevin Mazur/WireImage)
WASHINGTON - JANUARY 20: Ashton Kutcher and Demi Moore at MTV and ServiceNation's 'Be the Change: Live From The Inaugural Ball' at the Washington Hilton on January 20, 2009 in Washington, D.C. (Photo by Kevin Mazur/WireImage)
BERLIN - FEBRUARY 11: Actress Demi Moore and boyfriend Ashton Kutcher attend the 'Happy Tears' premiere during the 59th Berlin International Film Festival at the Berlinale Palast on February 11, 2009 in Berlin, Germany. (Photo by Dominique Charriau/WireImage)
LAS VEGAS - AUGUST 05: Actor Ashton Kutcher (L) and wife actress Demi Moore arrive at the Las Vegas screening of Anchor Bay Films' 'Spread' held at the Brenden Theatres inside the Palms Casino Resort on August 5, 2009 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images for Anchor Bay )
EAST HAMPTON, NY - AUGUST 08: Actors Ashton Kutcher and Demi Moore attend the 'Spread' screening at the UA East Hampton 6 on August 8, 2009 in East Hampton, New York. (Photo by Steven A Henry/FilmMagic)
�2010 RAMEY PHOTO Demi Moore and Ashton Kutcher stand on the sidelines before the Indianapolis Colts and New Orleans play in Super Bowl XLIV at Sun Life Stadium in Miami Florida in February 7, 2010 SPNY (Photo by Philip Ramey/Corbis via Getty Images)
LOS ANGELES, CA - FEBRUARY 08: Actor Ashton Kutcher (L) and actress Demi Moore arrive at the premiere of New Line Cinema's 'Valentine's Day' held at Grauman's Chinese Theatre on February 8, 2010 in Los Angeles, California. (Photo by Kevin Winter/Getty Images)
HOLLYWOOD - FEBRUARY 08: Actor Ashton Kutcher and wife actress Demi Moore arrive to the Los Angeles Premiere 'Valentine's Day' at Grauman's Chinese Theatre on February 8, 2010 in Hollywood, California. (Photo by Jon Kopaloff/FilmMagic)
NEW YORK - MAY 04: Actors Ashton Kutcher and Demi Moore attend Time's 100 most influential people in the world gala at Frederick P. Rose Hall, Jazz at Lincoln Center on May 4, 2010 in New York City. (Photo by Theo Wargo/Getty Images for Time Inc)
HOLLYWOOD - JUNE 01: (L-R) Producer Scott Aversano, actors Demi Moore, Ashton Kutcher, director Robert Luketic and actress Katherine Heigl arrive to the premiere of Lionsgate's 'Killers' held at ArcLight Cinema's Cinerama Dome on June 1, 2010 in Hollywood, California. (Photo by Alberto E. Rodriguez/Getty Images)
PASCHING, AUSTRIA - OCTOBER 29: Demi Moore and Ashton Kutcher attend the photo call for their Charity Gala at PlusCity on October 29, 2010 in Pasching near Linz, Austria. (Photo by Andreas Rentz/Getty Images)
US actress Demi Moore and husband actor Ashton Kutcher cuddle during the launch of a UN fund aimed at helping fight against human trafficking at the United Nations headquarters in New York, November 4, 2011. US actors Demi Moore and husband Ashton Kutcher launched the UN Voluntary Fund for Victims of Trafficking in Persons, especially women and children, as part of the UN Office on Drugs and Crime (UNODC), aimed to provide humanitarian, legal and financial help to victims of human trafficking. AFP PHOTO/Emmanuel Dunand (Photo credit should read EMMANUEL DUNAND/AFP/Getty Images)
REDONDO BEACH, CA - NOVEMBER 07: Actors Ashton Kutcher and Demi Moore attend the Freedom Awards and Freedom Rocks Event at Redondo Beach Performing Arts Center on November 7, 2010 in Redondo Beach, California. (Photo by Amy Graves/WireImage)
BEVERLY HILLS, CA - FEBRUARY 22: Actors Ashton Kutcher (L) and Demi Moore speak onstage at the 13th Annual Costume Designers Guild Awards with presenting sponsor Lacoste held at The Beverly Hilton hotel on February 22, 2011 in Beverly Hills, California. (Photo by Alberto E. Rodriguez/Getty Images for CDG)
NEW YORK, NY - APRIL 14: Actors Ashton Kutcher and Demi Moore attend the launch party for 'Real Men Don't Buy Girls' at Steven Alan Annex on April 14, 2011 in New York City. (Photo by Charles Eshelman/FilmMagic)
NEW YORK, NY - JUNE 09: Actor Ashton Kutcher and actress Demi Moore attend the NewFront conference presented by Digitas and The Third Act at Skylight SOHO on June 9, 2011 in New York City. (Photo by Henry S. Dziekan III/WireImage for The NewFront)
Actors Ashton Kutcher and Demi Moore attend The Urban Zen Stephan Weiss Apple Awards at Urban Zen on June 9, 2011 in New York City.
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