SOMEWHERE between Abu Dhabi and Lusaka, the US's most powerful diplomat sat down with her closest aide last week and talked of straying husbands, predatory women and internet sex. It was not quite what Hillary Clinton had intended when she set off on her latest tour as US Secretary of State; yet it is hard to think of anyone in Washington better equipped to offer advice on the painful fallout from a sexual scandal. For once, the shenanigans had not involved Clinton's husband, Bill. Yet the saga of congressman Anthony Weiner's penis and how its picture turned up in cyberspace...