So I bought these the other day, I tried the XL was a little over ambitious, it was a no go. So I decided to train myself up with the medium. Went right in no problem, and wore it for about 15 mins, before I had to take it out. I then was working in the XL again, took about 30 mins of work, and when it did I nearly ate the whole thing!! Wouldn't that be an embarrassing trip to the ER. Luckily half of the flange didn't go in, and was easy to extract.
The widest is nearly as big as the flange so I gather my sphincter didn't fully close as it was taking in the plug. I recommend and will try myself in a few days, to tie a rope to the end, and take it easy. You don't want to do damage to yourself.
Too bad, I was looking forward to wearing the XL for a little bit. All well perhaps next time.