I don't think I would classify it as erotica - the sex is more a reflection of certain personalities encountering extreme social changes. I guess to be more specific, I'm looking for science fiction markets that don't mind sex and violence as integral elements to the world of the story. If I were to compare the vibe I'm trying to get at, it would be a bit like Moorcock's Cornelieus Chronicles - sex and sexuality are suffused throughout the story, but in an almost off-hand way, providing a background for the characters emotional arcs.
Does that make sense?