I tried a dry run several days ago. I'm a virgin, but extremely familiar with my anatomy, and active in other ways. I tried the punchdown fold. I have a difficult time keeping it folded while inserting it without, if you'll pardon the expression, sticking my whole hand up there with it. Obviously, that's not going to be ideal for a real run. Regardless, it didn't open. Oh-- well, it did, it just waited until I had nearly taken it out, and then waged an attack on my ladyparts with a vengeance. POP, right at my entrance.
So there I am, laughing and bleeding and bleeding and laughing.
Subsequent tries have fared no better (more of the bleeding, less of the laughing). Am I trying to insert it too vertically? Also, how do you grip the base and insert without your fold popping loose? Anyone else have issues like this?