I am worried about the use of glass. I'm sure it's fine 99.9% of the time, my obvious concern is it breaking with disasterous results. The idea of something so uncompromising is a turn on though. I currently use a plastic/rubbery type plug on my girl and am v happy with that but does anyone have any reassurances regarding glass plugs, are they engineered in a specific way? or made to shatter in certain way? are there any inherent safety features?

I watched Pinky and the Brain the other day :

Pinky - What are we doing this week Brain?

Brain ( in inimitable style ) - Same thing we do every week Pinky...taking over the world