There have been a few posts about cups staining lately, which has gotten me to thinking... When I had a Keeper, it definitely stained. But my yellow and pink Ladycups, which I have been using for over a year, show absolutely no sign of staining whatsoever. Since the Keeper is made of a different material than the Ladycup, I guess I can't really make a very good comparison. But has anyone else in general noted their different cup brands staining at different rates? Staining doesn't really even concern me, I mean, whatever, no one ever sees my cup, but I can't even imagine my Ladycups staining! Am I just lucky and/or weird?