My husband watches rape porn

My husband recently admitted to me that he watches rape porn. I've been feeling sick to my stomach and completely repulsed by him ever since. He knows that I have been raped - not once, but twice. He also knows that even though it has been several years, I still have issues because of what's happened to me in the past. I know it's just fantasy, and I don't really have a problem with him watching porn to get off when I'm on my period or not in the mood, but I have a real problem with him being turned on by watching rape, when he knows it has happened to me. Is this normal behavior? Am I wrong to feel this way? I want to be able to let it go, but I just can't seem to make it okay in my head. Have any of you dealt with this before?