How do I satisfy my desires for rough sex without ruining my relationship?

Legendofdon
I've been with my girlfriend several months and have a good idea with what I can and can't do to her and it's really not half way enough to satisfy me. I don't want to ruin our relationship because of my sexual desires. Prostitutes can usually endure me at my roughest but I don't want to cheat on her by getting a hooker or break her heart by asking. I'd keep manhandling my exes until they either learned to love it or accept it but this girl still hates when I rough her up when all my exes loved it after months. I've never been with a girl who wanted so much input during sex I'm used to girls being turned off if I ask permission before everything I do. This girl has scolded me for not asking before pinning her into a new position and I don't know what to do. Every time we have sex all I can think of is grabbing her hair, smacking her across the face, spitting in her eye, and unleashing all my pent up wrath on her.
How do I satisfy my desires for rough sex without ruining my relationship?
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