While Ehrenfels’ treatise on sexual ethics of 1907 might understandably be considered extremely controversial and inappropriate by today’s standards, it was much less so at the time it was written. Most of the seemingly radical ideas and proposals were relatively popular and widespread in educated society at the time, and the controversial nature of his article is rather due to the original way in which Ehrenfels combines and connects them, taking them to considerably farther reaching conclusions (compare Dickinson 2002, 265–268). The general tenor of this treatise was already anticipated in literary form by Ehrenfels’ choral drama Siegmar und Heliea from 1898/1899 (see PSII, 28 ff.).