As long as the story isn't focused on sex, I don't see why it needs to be labeled as 'porn'. I would say porn would be mainly for sexual gratification, whereas something that would not be porn would be story-centric. And you know, sex could really drive the story if you play things out well enough. /nod
As for your ideas.. I totally understand what you're dealing with. What I do is that, as soon as I get an idea, I take a sticky note and write down little things to help me remember it when I actually sit down and write. I have a collection of stickynotes in my closet/work area. /laugh
If you need any help, feel free to drop me a note, and, I'd love to read your work when you are finished. ♥