a plane to Afghanistan, and spent a year "embedded" with Petraeus and his team. Melbourne psychologist Erica Frydenberg considers the book the key motivation for the affair. "Intellect, power and success are very attractive qualities, especially for women. And in this case I think it was a case of personal advancement. She wanted a bestseller," Frydenberg said. "From his point of view I think it was flattery. She's a much younger, very attractive, very intelligent woman and I think he would have been flattered by her attention." And so their relationship developed, until the pair both admitted the affair to the CIA. But flattery has consequences. At a press conference after his resignation on Friday afternoon, Petraeus told the press he had made a "terrible judgment". Second only to the threat the relationship posed to national security, of course. Reports unfolding this week have revealed that the pair had been a subject of intense investigation for a number of months. Given the CIA were behind the investigations, the chance of their affair being discovered was only a matter of time. Some analysts have said the Petraeus apology and resignation was far too pre-emptive. President Barack Obama was said to have rejected the General's first attempt at resignation. Meanwhile, American reporters have been unable to contact, or even see Bradwell. The only sign is a poignant "Dad loves Mom", scrawled into the chalk on the couple's North Carolina driveway. Petreaus is far from an anomaly. Bill Clinton and Jack Kennedy are