Robert A. Heinlein has a new, apparently steamy book coming out in November.
"For Us, the Living" was written by Heinlein about 1938-9, before he wrote his first sf short, "Lifeline." The novel, "For Us, the Living," was deemed unpublishable, mainly for the racy content. So racy is/was the content that in the 1930s the book could not even have been legally shipped through the US mail!
Link via Kevin Drum.