The accusation that eighteenth-century Berlin was home to sexual affection between men presumably gained traction because of the rumors surrounding Friedrich II, known in English as Frederick the Great. While the Age of Goethe did not have a vocabulary of "homosexuality", "bisexuality", or "heterosexuality", it did possess an emerging rhetoric of "sexuality". The concept of the Bildungstrieb relies on the notion of Bildung, which is famously difficult to translate. The Age of Goethe's focus on Bildung produced a new genre, identified by Karl Morgenstern as the Bildungsroman in his 1819 lecture "Uber das Wesen des Bildungsromans" ("On the Essence of the Bildungsroman"), which was published in 1820. The bildungsroman is classically the story of the development or acculturation of typically a young man who discovers who he is and how he fits into society. A distinctive aspect of the Age of Goethe's discussion of sexuality is its fervent and sensual depiction of intense physical and emotional friendships between men.