My boyfriend has OCD and tends to obsess over past mistakes. Recently he became really upset over erotic fiction he read online at 13 or so. He recalls very clearly reading fiction of around his age and he found it easily on Google, he did not have to search hard at all. He is super scared that he somehow read a story where the characters were way younger and he's scared that if he did and just didn't remember or repressed it out of guilt, that it automatically makes him bad and unworthy of love, hence he told me this. He's scared that "who is to say a character wasn't 9 or something and I just ignored it at the time and forgot I did it?". He is extremely guilty. He is adamant even if he did, he would only have pictured people his own age or older anyway, as that was what he always was and has been into. Again he doesn't actually remember ever reading anything below his age. 

He has had false memories before where he takes something bad (like reading these stories where they were around his age) and made it way worse. He feels that logically this wouldn't have happened, he would remember and surely he would be weirded out back then by by much younger in a story but what if?? I feel like this might be a false memory again but what if it isn't? To what extent should someone be held accountable for something they don't remember doing at 13?