Quote Originally Posted by TheThinMan
I doubt that would be wise. Glass doesn't have any give, and it has the chance of breaking should you try to go about normally while wearing it.
Glass is sometimes much stronger than you think. Perhaps a drop test would be in order.

Unless something hard struck you in the anus hard it shouldn't break. And we all know that doesn't happen every day. And on the rare chance that it did, your butt would be damaged plugged or not.