Trying to Replace bad thoughts with good thoughts

Trying to Replace bad thoughts with good thoughts to Neutralize the bad thought.

Today, the thought going through my mind was of my friend’s 13 y/o old daughter again (same thought previously listed) and how she probably doesn’t have pubic hair and then the thought of my penis going into and out of her vagina. It was pretty graphic and the more I tried to get it to stop the more it intruded. From the intercourse just kind of happening to her sitting on my lap and my penis going in and out. The image was of her vagina being tight of sorts, pretty intense thought. I noticed myself trying to ritualize it with replacement thoughts. Picturing in my mind an image of a Porn star I saw recently with a shaved vagina and blonde hair and then pictured myself having sex with her instead. But I stopped doing that and went back to the original thought and accepted that it was there and that there was nothing I could do about it. There was a tingling feeling in my groin area, but that didn’t bother me as I know that that is actually an unrelated response. The problem and pain I have with these thoughts is that I have the same thoughts as someone who enjoys having these thoughts. Which is demoralizing to me. Then when I think the worst is over the image of me rubbing the hole in the tip of my penis into her clitoris.
Other thoughts popped in my head too., such as:
-Damn, why did this thought have to happen, if only I had not visited my friend, everything would be fine. Which I know now that isn’t true, my OCD would have found something else to disturb me. But when dealing with this growing up and being undiagnosed and untreated you (I) will do anything to get rid of these thoughts as we (Undiagnosed OCD Sufferers) don’t know what’s going on with us and are desperate to find some form of peace.

No point trying to avoid having these thoughts, just keep your mind busy and you won't think about them. If you force them out, you will still get them back later. Just accept them, don't force them out. Then again, you can't control what thoughts you have.