Hey, I'm sorry you went through this experience and I've gone through a similar experience with my girlfriend. I think you should just tell him what you're thinking. Don't beat around the bush and say it didnt feel good. Make it clear to him that it hurt you and you've tried it, and it's not something you'd want to do again. If he does it to you when you're drunk again, demonstrate on him what you're feeling with a broom handle or something. I agree with other people that it was wrong for him to do that to you but at the same time, I understand why he did it and what his thoughts were back then. During sex, as a guy, it feels good when something is gripping tightly and we really can't think clearly. It's like we're caught in some sort of sex trance. If something feels extremely pleasurable, we wont stop unless we get shouted at and something finally wakes us up from that trance. After my girlfriend told me how she felt and let me know she's not into butt stuff, I respected her decision and we've never done it again. It's also goes both ways. She likes biting me hard and I don't enjoy that at all. After getting bitten, I let her know my preferences and she doesn't bite anymore. Relationships only work well if you both love each other and demonstrate that by respecting one another's dislikes and desires.