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He says women are more active than men on his message boards.

Mitchell admits receiving his share of angry letters from husbands and wives who've been done wrong, but says that's less than one-tenth of the e-mail he receives. "I can't say those people are wrong. Everyone has their own moral code," he says. "It's always best to be honest, and honestly, this works for me."

A philanderer isn't a bad person as much as a person who finds his marriage is missing something, and an affair might be that certain spark, he says.

"You would never know if you met me," he says. "I could be your next-door neighbor."

But what if Mitchell found that his wife was cheating on him — or worse yet, if she were one of the many happy customers on philanderers.com? "I guess I couldn't say much," he says. "That would be like the pot calling the kettle black."

3. Liar-for-Hire: The Perfect Alibi Agency

Need someone to call home to say you need to work late? How about a service to send all your mistresses bouquets on Valentine's Day?

A German company called "Perfect Alibi" claims it provides about 350 clients each month handy excuses, such as bogus invitations to weekend business seminars. Such liar-for-hire services range in price between $13 and $104, depending on the nature of the alibi, and a $35 annual membership fee.

4. Is Chatting Cheating? The advent of Internet dating over the last few years may have changed courtship more than anything since the advent of the pill.

Some married folks miss that thrilling yet harrowing experience of flirting with a stranger via e-mail. This could be why so many straying spouses slip off their wedding ring and into an online persona.

All online dating services say they've had trouble with married men posing as single dreamboats.