Hey, sorry you are having tough times. It is interesting how OCD sufferers share the same problems, because that was exactly what I was going through back then. The images interfered even when I was in orgasm and it made me freak out because isn't that supposed to be where your animal self should come out, if the images come then I should be secretly guilty. That was my fear especially but the brain is always active and you fear something, you will see it even in orgasm. And before it was only a thought, I obsessed over it and got groinal responses and it escalated. Weird thing is I really like girls but I do not have groinal responses when I just see them around but when I used to see whatever I was afraid of at that moment, I got groinal responses. Even there you can see I was wired to that response because of fear and to check myself, not other things.
For me it first involved men because I was afraid of being gay, whatever happens if you become gay anyway, then turned to children for a short time, and was very disturbing but then I started wanting religious comfort and prayer, etc, and THEN the images stopped being children and turned into religious figures, because that was the biggest sin. In time I understood I will just see what I fear to see, and it will just feed on my fear. And if I fear it then I am not really wanting any of it. It then gradually became easier and finally dissipated. I can't really pinpoint if this was the exact reason I got rid of OCD because I was dealing with other OCD issues as well like the user above, cursing etc, and lighter problems like continiously checking if I turned off the gas, so I was trying a lot of methods and just living my life not letting them bother me, but this certainly helped a lot. You will get over it, too especially if you already were better before.
If you haven't checked them out, there are also OCD specific forums by the way, with great advice in it.