There must be a connection between the lust for power and impotentia coeundi. I liked Marx, I was sure that he and his Jenny had made love merrily. You can feel it in the easy pace of his prose and in his humor. On the other hand, I remember remarking one day in the corridors of the university that if you screwed Krupskaya all the time, you'd end up writing a lousy book like Materialism and Empiriocriticism.