While it's too late to save the late, great General David Petraeus from his philandering ways, future generations of men could be in luck. While the Lord may have made a rambling man, research suggests that a quick shot of the hormone oxytocin could be just what the doctor ordered for married men who want to keep their vows sacred while being constantly confronted with women they could conceivably have sex with. Which to most men is, yes, all women.
If you're trying to hide an extramarital affair, and you're the director of the Central Intelligence Agency, it's probably a good idea to use a method that hasn't been publicly known for years. Another good step would be avoiding a service, like Gmail, managed by a company that's been known to hand over information to the government when pressured. Perhaps David Petraeus and Paula Broadwell thought they were above all that, or perhaps they somehow didn't care, but the trick they used to hide their emails is old enough to have been included in a 2005 PBS special.