When I inserted a finger, it was quite easy to stick it under the rim of the Instead because (1) The Instead has no suction and (2) It sits so that the opening faces my spine, rather than facing up like the Diva Cup. I figure this is why it didn't leak while I was laying down: the opening of the cup would have been facing the ceiling at that point, so it was catching the blood.
Here is what puzzles me: Without suction, how on earth does the softcup avoid leakage when its opening is perpendicular to the floor? And how on earth does it handle all the poking from sex without getting dislodged?
Help! My libido begs you.