Techniques

You don’t need to prevent anything from coming into your brain. I know (cause a lot of mine take this form) that intrusive mental images or commands or statements can seem more scary than the more hypothetical “what ifs” but they’re no different. Don’t try and avoid or fight or prevent as this is a trademark compulsion. Instead, I like to either do nothing or give it a non-engagement response like “cool one dude!” “Love this one” “thanks for sharing man hope you come back!”. I know it seems scary and very weird to do this to mental images of even taboo stuff, but this is the treatment that works. Hope this helps. :)

Our brain has built-in mechanism to clean up memory spaces, so it can reuse it. This process is not under our control like breathing or regulating heart beats. So it presents the thoughts to awareness to see if you develop any emotional reactions to it, whether negative or positive, and if you do it will keep bringing it again and again and again.... until you have no reaction to them. Just let the thoughts be, and go live your daily life.