In her new memoir, Inside Out, set to be released September 24, Demi Moore revealed that she and ex-husband Ashton Kutcher had two threesomes during their marriage.

She also wrote that he then used the encounters as an excuse for him cheating on her later. According to Radar, Demi wrote that she only wanted to please Ashton by engaging in threesomes, but she now believes that doing so was a “mistake.”

“I wanted to show him how great and fun I could be,” she writes, according to the outlet.

In 2010, Demi saw media reports claiming Ashton met a 21-year-old woman while bowling with her daughter Rumer Willis. As Radar reports, he eventually cheated on her in his marital home while Demi was out of town filming a movie.

When she confronted him, he brought up their threesomes as a defense, according to the book.

“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,” she writes, adding it was to “deflect blame.”

Earlier this month, the New York Times released quotes from the book, in which Demi detailed suffering a miscarriage six months into her pregnancy in the early 2000s.

Demi “started drinking again and blamed herself for the loss,” though she and Ashton tried to conceive again through IVF.

Read more at Radar.