This had me crying with laughter. As a happily married man (for many years) who happens to have a female best friend (also of many years), it always cracks me up when people from my evangelical past get their knickers in a twist because I sometimes (shock horror) socialise alone with my female best friend. It makes me laugh that they think I give an airborne fornication about their opinion when the people whose opinions actually matter - ie my wife and my best friend's husband - are all fully aware and have no issue with it. Indeed, my wife believes my friendship has actually helped our marriage, as said friend has often helped me consider matters from my wife's perspective. My best friend's husband (who is also a close friend of mine, though not as close), thinks I have done the same for his marriage.

Beyond that, in my experience of evangelical circles, the Billy Graham rule is used to always assume the worst of women. Furthermore, it is also used to perpetuate workplace inequality (in religious organisations). For example: In a Christian TV station I know of, a male and female producer were forbidden from travelling together to "avoid the appearance of evil". This happened many times, and on all such occasions, it meant the choice producing gigs went to the man rather than the woman.