08/14/2008 12:45 pm ET Updated Nov 17, 2011

Why Do Men Cheat?

Since time immemorial, men have cheated. They cheat on beautiful women, they cheat on smart women, they just plain, old cheat.

And yes, women cheat too, but in light of recent events, we've decided to stick to the menfolk for this one.

According to Newsweek's panel of analysts, men cheat for a variety of reasons.

They Want More

The problem is that they never seem to get enough excitement. "Their experiences have to be either very new or very intense, or both, or else they get very restless," says Zuckerman. "When things get monotonous, they have to do something else to increase their arousal."

They Like The Thrill

For these types, the risk itself is part of the reward. "Breaking rules is a thrill for them," says Frank Farley, a psychologist at Temple University. "Look at Spitzer: he's Mr. Rectitude, the terror of Wall Street, and he busts prostitution rings, and yet he allegedly goes into that very lions' den--the prostitution ring--and partakes. If that isn't risk-taking I don't know what other
label to put on it."

Too Much Testosterone

Alpha males are high on testosterone, the hormone that underlies almost all the typical traits of the politico-sexual animal: high levels of testosterone make for a high sex drive, a love of risks, aggressiveness and competitiveness.

They Want Power

As the saying goes, power is also an aphrodisiac--and that's been true, says Kruger, as long as humans have been around. "In our evolutionary history, men who had lots of resources and status and power were able to have more than one partner. Your body is basically saying if you have this power, you should use it, because that's what has worked before," [Gastil] says.

They Think They're Invincible

"It does have an element of Greek tragedy to it. There's a certain amount of hubris that goes with getting to the top," says Gladue. "You think you're invincible. You just don't think it could happen to you." Until, of course, it does.

What do you think? Have you ever cheated? If so, why? Tell us below!