Think you know everything there is to know about marriage? Think again. Many of the commonly held beliefs about how to have a great relationship -- such as never going to bed mad -- are being challenged by "Love Doctor" Terri Orbuch over at eDiets. Orbuch says that healthy relationships are key to not only mental and emotional health, but physical well-being as well. If you've ever had a spat with your spouse, then you know how rotten it feels. That stress can wear on you over time.

Orbuch says to go ahead and go to bed mad. It's better to cool off than say things you don't mean in anger. There are nine other "myths" she attempts to bust, so if you're married or in a long-term relationship, it might be worth your while to check it out.