I recently read an article by Ty Grigg about why he thinks that the Billy Graham rule (basically not being alone with a woman that is not your wife) should be challenged. You can read his thoughts on the topic at this link.
Though Pastor Grigg puts forth a number of arguments, some of which are halfway persuasive, I really only have one response. This is not my only reason why I disagree with him, but it is a major reason and one in which I feel trumps any notion Pastor Grigg wrote down in his article.
I follow the Billy Graham rule because I love my wife and she wants me to follow it.