OCD thoughts are distorted thoughts related to anxiety but cognitive distortions apply more to how you perceive a situation due to biasing factors or thought patterns. I don't know if that makes sense.

It is really hard to know what techniques might help when the social, personal, and environmental factors can vary so much from person to person. I completely understand what you are saying and I respect your desire to keep your own obsessions private. I am just not sure how to answer your question. I guess the real question is whether whatever technique you choose to use causes more stress or not and in what regard. Would affirming the thought cause distress because it acknowledges something that is morally wrong and reflects badly on you? Or would affirming the thought cause you distress because it is going against what the OCD is telling you is true (and therefore you must be wrong)? Does it really matter in the end? Because even if your OCD is trying to tell you that you did something or thought something that is socially or morally wrong, the odds are that whatever it is doesn't apply to you anyways. So what do you have to lose by flipping the nagging voice in your head around and asking the OCD 'So what if I am ____?' I'm sorry if I'm not helping; it's hard in such general terms to answer your question.

It sounds like you have a complicated case. My best suggestion would be to find a therapist who can help you work through this stuff. He or she would not only be able to help you with exposure and thought challenging techniques but also be able to help you acquire other tools to use in instances such as when you try to challenge the thoughts and the anxiety only increases - stuff like deep breathing, mindfulness, muscle relaxation exercises, etc. In my experience, treating OCD requires action on all fronts. It usually isn't just self help, or therapy, or medication. It's a combination of a lot of different interventions all working at once.

Have you considered medication?

And also - I did not think that you were a rapist or were even implying such. I understood that you were just giving an example.