What does accidentally mean? Did you know going into it there was gonna be nudity? Did the title hint at nudity? Did it say NSFW?
I think you should think that if you relapsed you should have MO'd after you saw that. Did it happened? Just like BackcountryCamping said: "Did you know going into it there was gonna be nudity?". That's very important. I believe that you should avoid that at all if you are trying the 100 days journey, since that that can lead you to the stuff that most guys here are trying to stop watching. Best regards and stay strong!
I dont know... I would say being aware of it and continuing to go through with it? I would count that but I know a lot would argue.