Freebooksy thinks they have an even better service for erotic romance readers than an email full of free books. An email full or non-free erotic romance books that is "a discrete way to discover books that you'll love".
Ah, that classic combination of suggesting erotica is shameful and selecting the wrong homonym. Unless the problem with other book promotion services was their hopelessly conjoined and non-detached nature.
Anyway, it's called Red Feather Romance.