Full of sex toy questions tonight, guys.

So, I am planning on getting a glass dildo for g-spot penetration. I'm getting it for myself, for my partner to use on me, and for temperature play, but I'm curious about something. I want to get a toy that I can use for double penetration with my guy for when he is penetrating me anally. Because glass is so hard and obviously has no give, is glass a bad choice? Do any of you guys ever use glass dildos this way? Or would I be better off with something more flexible and with some give?

Any suggestions would be great...though, I'm not interested in realistic looking dildos. It's just an aesthetics thing for me; I'm turned on by real penises, turned off by realistic looking, disembodied penises. Whimsical dildos are my preferred look.