Comics Alliance has an essay by Sarah Horrocks on Guido Crepax’s trippy bondage/erotica comic Bianca. Crepax is probably best known outside of Italy as the artist of the Story of O and Emmanuelle comics adapations.
Like Alan Moore and Melinda Gebbie’s Lost Girls, Bianca is more obsessed with artistic execution than with sexually arousing its audience. In fact, I think that for the most part, Bianca fails as porn. Indeed, if it were more successful as porn, it would probably be in print in English.