Quote Originally Posted by slavecat
just had to add, on the glass note...most glass sex toys are made of Pyrex glass. it is shatter-proof and can withstand tempatures up to 500 degres F. (not that the temp thing has anything to do with this). to break one of those plugs/dildos, you would have to hurl it at concrete full force and even then it will probably just chip or crack a little.
Slavecat is correct about the strength of a glass butt plug. I have used a glass plug for several hours (nearly six) and it seemed strong enough. Despite the strength of the glass plug I recommend that one should always be careful.