According to a 2001 survey, about 15 percent of men admit to cheating on their wives or girlfriends, and women were not far behind with a 10-percent cheat rate.
But here's one thing that hasn't changed -- women are willing to forgive their husbands for infidelity, and men aren't. A recent study found that men were significantly more likely to end a marriage based on spousal infidelity than women.
"Men can forgive themselves for their indiscretions but find it harder to forgive their partners for the same," therapist Phillip Hodson explained to England's Daily Mail. "For a betrayed woman, an affair is an offense against her dignity. For a betrayed man, it's an offense against his manhood. It goes right to the core of his identity."
Relationship counselor Paula Hall told the paper that husbands can't get over the fact that their wives had sex with another man. "For men, the sexual component of their wife's affair is important," Hall said. "Women are much more likely to ask: 'Did you love her?'"
And women are cheating for the same reason men do: they want affection and attention, and the Daily Mail notes, that's going to lead to sex.
Check out some out some female celebrities who may have succumbed to the cheating bug. We can't say for sure that their guys left them over it, but their marriages did dissolve soon after. (See Also: Why He Cheats)
LeAnn Rimes: Sparks really flew when Leann Rimes was caught cheating on her husband of seven years, Dean Sheremet, with actor Eddie Cibrian who was also married at the time. Apparently the love affair started when Rimes and Cibrian were filming Lifetime's 2009 flick "Northern Lights." Although Rimes and Cibrian ended up leaving their spouses for each other, a few months later rumors circulated that Cibrian was already cheating on LeAnn. He has denied it and sued Life & Style magazine for spreading the story.