Hi Chris, I do that to with conversations. I'll Replay them over and over again in my mind. Analyazing everything! I have pre-converstions, consantly! I feel like I always have to be prepared before taking to someone. I also think things through constantly, but I don't view that badly, though. Anyway, all my compulsions are mental, too.
What has helped me the most has been using some techniques from myself help books - Freedom From Obsessive Compulsive Disorder, by Jonathon Grayson and Obsessive Compulsive Disorders, by Fred Penzel.
The last few years my main problem has been the "sexual fears". Intrusive thoughts about children, woman and family members. I hope they don't delete that! We aren't supposed to talk about that stuff on the OCD board.
Anyway, I believe I read that you had the same problem. Well, I can tell you can get better by doing CBT and exposure things. I'm way, way better than I was 6 months ago when I first started working hard on the self-help things.
It is an up down process, so don't get discouraged. Be there a few times! But I just keep at it. Persistance is the key!