John Edwards, Arnold Schwarzenegger, Tiger Woods, Anthony Weiner...what do all these men have in common? You guessed it -- cheating. Granted, Rep. Weiner appears to have only "cheated" in the online sense. But take a look at our coverage below to explore why they do it.

As the Anthony Weiner scandal shows, couples should establish what's appropriate or inappropriate online, say experts.

And what about women? Do they cheat for the same reasons?

Some people cheat in relationships, others don't.

New research shows the area of the brain associated with addiction is triggered during breakups.

Dr. Helen Fisher explains why it is so hard to look away when a well-known celebrity has been unfaithful.

The ability to commit to a romantic partner may be more rooted in childhood and adolescence than previously thought.

Cheating, lying and stealing certainly aren't new social practices, but they are apparently fashionable now.

A new study says that males, not females, are more apt to have shaky mental health during a rocky relationship.

Even a slight whiff of a woman's tears can dampen a man's libido.
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