The Erotic Adventures of Tintin, often referred to as the forgotten book in the series, was written by Hergé in 1969, tapping into the psychadelic bohemian lifestyle that had become de rigour within Western Europe at that time. Drawn in the familiar ligne claire (French for "badly drawn") style of drawing pioneered by Hergé, the book was received with mixed reviews by fans and critics alike. Many people feel that the decision to create the story was to keep pace with Albert Üdërzö, whose Asterix and the Thousand Vestal Virgins had been published the year previously.