It may sound strange but i'd check out GOG. They have been accepting adult games the last year or so and this would give a DRM free option to those who value it.
I've looked it up and, at the moment, GOG operates on an "invite only" basis. I could submit my game but I doubt it would be selected at this stage of development. I eventually want a Steam page, but again, it'll need to be further along in development before that option becomes realistic.
