Clockwise from upper left: Melissa, Sarah, Michelle and Crystal

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It's the side of infidelity we rarely get to hear about—from the "other woman."

Sarah (upper right) says she met one of the married men she dated at a business dinner. "He was a very distinguished businessman, high-profile, a lot older than me," she says. "He pursued me very hard. He would phone me constantly, text messaging and calling." She says she's since dated "countless" other married men.

Melissa (upper left) was married when she began seeing a married man she met in a coffee shop. "My husband thought our marriage was fine," she says. "I was always wanting an upgrade."

Crystal (lower left), who says she's dated two married men, says that one man would buy her lingerie and they'd meet at her apartment. "He would really like for me to be sexy for him," she says. "I felt I could offer him great sex, and that his wife could not offer him that."

Michelle (lower right) says she began seeing a man in Las Vegas almost seven years ago. He was also seeing a long-time girlfriend, whom he eventually married. After a brief breakup, Michelle started seeing him again—and they're still dating. At first, it was strictly a physical relationship, Michelle says, but when she later moved to his town, the affair became emotional as well. "We ended up spending a lot more time together, so I got to know him at a deeper level. It was more about who he was, what he wanted, and it was a lot more intimate than it had been."