Have I been living under a rock?
The NPR top 100 list for romance includes three erotic romance titles, two of them from Ellora's Cave, and none of them familiar to me. They seem to be neither old classics nor recent red-hot sellers.
Nature of Desire -- Natural Law by Joey W. Hill (Ellora's Cave, 2008)
Liberating Lacey by Anne Calhoun (Ellora's Cave, 2015)
The Lady's Tutor by Robin Schone (Kensington, 2000)