In a new study conducted by marriage counselor M. Gary Neuman, it's estimated that one in 2.7 men will cheat—and most of their wives will never know about it.

Gary documented these findings—and many others—in a groundbreaking new book. To write The Truth About Cheating, Gary surveyed hundreds of faithful and cheating husbands to uncover the real reason some men stray.

A. What's the number one reason men cheat? Ninety-two percent of men said it wasn't primarily about the sex. "The majority said it was an emotional disconnection, specifically a sense of feeling underappreciated. A lack of thoughtful gestures," Gary says.

Gary says the other woman often makes the man feel better about himself. "[She] makes them feel different. Makes them feel appreciated, admired," he says. "Men look strong, look powerful and capable. But on the inside, they're insecure like everybody else. They're searching and looking for somebody to build them up to make them feel valued."

B. If you want to secure your relationship and understand and have the knowledge of men, make them feel like they're winning with the things that they do for you."

C. Don't be afraid to praise your partner or tell him that you appreciate what he does, Gary says.

Every couple will eventually face certain life changes, but Gary urges couples to think back about the interest they took in one another when they were first dating or newlyweds.

D. Just as the little things are often signs that something is wrong, the little things can also help rebuild relationships, Gary says. For example, if a man tries to make breakfast and burns the toast, Gary suggests staying positive. "[Men] want to feel like they're pleasing their wives. … When you give him the message mainly that you screwed up, then believe it or not, it makes him feel insecure.

Most men meet the person they have an affair with in one of two places—at work or through a hobby. "It begins as an emotional relationship. There's a friendship that develops. It's not just looking for the sex," Gary says. "We all have this picture of cheaters as the bad guys. They're horrible, rotten, not nice. No, they can be nice people who get lost, who do the wrong thing—and they can be your husband."

Gary found several signs that a husband is cheating:
1. He spends more time away from the house.
2. You have less sex.
3. He avoids contact.
4. He does not answer his cell phone.
5. He criticizes you more.