This is my first time with inserting something up the urethra - outside of being catheterized once. First of all, I got the 8mm, and it seems to fit fine. Didn't pop out, although it seems to come out about a quarter of a inch after wearing. Was a little painful on insertion and some discomfort on wearing. Have worn it about half and hour on the first try. I hope the discomfort will subside on subsequent wearing. I like the idea, and would have like the ring on the end to be of larger gauge.