I think I've always interpreted low and high maintenance the way Lilith described it. If you need a lot of anything from your partner, such that they have to make more than a casual or comfortable effort, you're high maintenance. Be that effort doors, flowers, big fussy deals on anniversaries, breakfast in bed, constant reassurance that you're loved and lovable, whatever.

I'm not high maintenance, never have been. I'm higher maintenance than I used to be though....not because my old ultra low-maintanance self ever put guys off (guess I never found them), but because I learned that some guys start to mistake low-maintenance for no-maintenance. Nothing feels worse than knowing you don't need much, but aren't getting even that.

So now, I make sure the people I'm serious about know what I need, and that I'm getting it and am terribly happy because of it. Works much better, not sure why, really.