Wanting rough sex...but not gettin any

I'm into some really kinky things and my bf now acts like a prude when it comes to sex he isn't willing to try anything with me : hand cuff, choking, biting, role play nothing just same ole same ole sex I don't know what to do...my ex before him was into everything let me explore all my ideas : biting, choking, he'd go down on me and just pleasure me for hours. I want that kind of sex life again I crave it so bad I've tried to teach him and tried talking to him about what I want and he just won't...he jokes about going down on me but never has and I seriously don't see him ever doing it. Any ideas on what I should do?