PARIS (Reuters) - Challenging one of the great taboos of French politics, a new book has laid bare the love life of the country's amorous leaders. Sexus Politicus, published on Thursday, reveals decades of philandering, adultery and seduction at the heart of the French state, with politicians of all colours apparently sharing the same passion for extra-marital sex. According to the book, President Jacques Chirac and his predecessors Francois Mitterrand and Valery Giscard D'Estaing have juggled the fate of France, their families and a bevy of lovers with great ease, helped partly by an acquiescent media.