I posted a rather long and rambling post on LVLM today on the question of whether lesbian romance is synonymous with f/f romance. Part diatribe, part stream-of-conscsiousness, part genre analysis, it explores many of the reasons I believe the two genres aren't simply six of one, half a dozen of the other.
Any of you all want to go check it out, please do! It's even mom-safe. And leave a comment--even if you think I'm full of hooey. I'd really like to hear opinions, even those that differ from mine.