Recent Spitzer affair uncovers "Mistress Day," a special date for cheating husbands.

It looks like Hallmark might have to get busy designing a greeting card line to complement their Valentine's Day collection. According to the New York Daily News, many cheating husbands like Spitzer reserve Feb. 13 for their mistresses. That means while Mom is busy schlepping the kids to the drugstore to buy some sappy card for her husband, he could be off enjoying a romantic tryst with another woman! "It might not be a nationally celebrated day, but it's at least a day to practice your 'mistress retention' skills," says Noel Biderman, president of AshleyMadison.com, a Web site with over 2 million registered members that arranges extramarital trysts for "when monogamy becomes monotony."

What's next? Cards for that special other woman on Mistress Day? With messages like...

What's a $4300 hourly fee, when you make me feel like a million bucks?

Being with you makes me forget I'm a dirty old man.

Let's run away together. I just need to be back home in time to take out the garbage.

Blech. Anyway, so, where was your husband on February 13?