Especially if one is active? As I've said before, my "other" job involves a lot of walking, bending, picking up, squatting, straddling, sitting in a splayed position, on and off the bike a dozen or more times, etc. Gotta wait for breaks to dash to the porta-potty so leakage would be BAAAD!
I've been Jonesin' for a UK Mooncup and have been offered a 2nd hand one -- but the stem has been cut off. It won't be a bargain if the lack of stem makes it unsuitable.
Just how important is that stem to a cup's stability to someone who does probably 300 touch-my-toes in a 5-hour shift?