JWs can get an "unscriptural divorce" but they can't remarry or else they're fornicating
If you get an unscriptural divorce that means that you cannot remarry because that would be fornicating...
HOWEVER....if you and the X decided to get together for a quickie after your not recognized unscriptual divorce you would also be DF'ed for fornicating. I believe that is still the policy so....you are screwed if you do and screwed if you don't.