I want more.

My husband is fine with choking, spanking, and restraints. I want more. I want him to slap me and spit on me, shove his fingers in my mouth. I want to call him daddy, but I fear he'll think it's weird. I want him to be relentless, I want a dom/sub sex life. But I've been raped, and I know he's afraid that doing some things will bring that back for me.. 
I don't know how to tell him that I want dirtier, I don't want him to think I'm unhappy - because I'm not, I'm overly satisfied with our sex life. I just want rougher and crazier.. So, help? How should I bring this up? How should I explain to him?