Using a beer bottle

Me and my boyfriend have been together for a year and we have a great sex life, we keep things interesting yesterday he asked me if we could use a beer bottle while we fuck, but he doesn't want the neck of the beer going in he wants the bottom of the beer going in, he likes seeing pain and I like the pain, so it works out for both of us. But I was wondering if anyone on here has ever done it or tried it. I watched videos and they made it seem easy but I tried it by myself to try and get an idea of it but it didn't happen lol 
So any advice will help THANKS 😆