what do you think about the Billy Graham rule?

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The Billy Graham rule is that people of the opposite sex should not meet, dine, or travel with one another unless their spouse is present. 
   
More information:
   
Graham is said to have drafted the rule in 1948 as part of a four-pronged moral approach to ministry — a series of regulations that became known as the Modesto Manifesto.
   
The manifesto was named after Modesto, California, the location where Graham and his ministry team met that year to more deeply consider ethical approaches to their budding organization. It was an important gathering, as the resulting regulations aimed to “uphold the highest standard of Biblical morality and integrity,” according to Graham.
   
He explained: “We all knew of evangelists who had fallen into immorality while separated from their families by travel. We pledged among ourselves to avoid any situation that would have even the appearance of compromise or suspicion. From that day on, I did not travel, meet or eat alone with a woman other than my wife.”
   
   
   
ADDITIONAL QUESTIONS: How would apply to medical, educational, political (where confidential meetings take place), and male dominated environments? Nurse care, ER doctors, obgyn doctors, family medicine, meeting a professor after class, business meetings, supervisors of the opposite sex in performance appraisals, relatives, national security meetings are examples to consider. Also what if the person of the opposite sex is gay?