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Susan Shapiro Barash, a gender studies professor at Marymount Manhattan College, interviewed 120 women who cheated on their husbands for her book A Passion for More: Wives Reveal the Affairs that Make or Break Their Marriages.
While Barash wasn't surprised about the reasons women expressed for cheating, she said she was surprised by the lack of guilt.
Barash said that 90 percent of the cheating ladies she interviewed said they felt no guilt.
"They felt very entitled — and felt entitled because they had been so unhappy in the marriage," Barash said on ABCNEWS' Good Morning America.
"It's a fantasy, it's just much more liberating," Barash said.
Barash found the subjects of her book by posting ads in YWCAs and asking women who contacted her to refer friends who were also having affairs.
According to Barash, 65 percent of the cheating women she interviewed said the --- was better with a lover than with their husband. Forty-five percent of the women said they remained married despite their affairs.
Jill Hollister, 41, told ABCNEWS' Good Morning America