The Story of "O" by Pauline Reage
Little Birds, White Stains, any erotica by Anais Nin
The Sleeping Beauty trilogy by Anne Rice
Reage and Rice are closer to BDSM - very powerful eroticism. Reage is a bit more intense in bondage but you can cull from it the sexual politics, also a book in my women and politics course as undergrad. Anais Nin is erotica in the dreamer's world.