Glad I saw the x-ray tag, I thought something very different was happening... not that this is much better... but at least it's not tearing open... urgh ulp
Have you? I have. It hurts a lot if you don't use some lube, and if you are stupid enough to force sounds that are too big into it, plus there is the discomfort for the next few days when your using the bathroom. Other than that? It's okay, and adds to the masturbation quite a bit.
Unfortunately the only way to insert a larger sound is to force it, and since some of the more dynamic sounds are 8mm....brace yourself for the pain. Good news? Once stretched it remains so. Too much information?
