If I ruled the world basic anal training would be mandatory for all white females from the ages of 8 - 14 for the sole purpose of maintaining rectal cavity elasticity and strength. The divorce rate wouldnt be going through the roof if they knew how to pleasure their men. Basic asshole fitness would be mandatory.
Tbh that glass could break under the pressure of the anal sphincter muscle and what happens next is quite self explanatory. It's probably a good idea to not do this and not encourage these type of activities.
First time anal (my dick). 2nd time anal (beer bottle) 3rd time anal (fully loaded mack truck) 4th time anal (the whole world). See how quickly those assholes grow up?