Same. I guess I always assume someone else will.
the only reason i'd report someone was if they were breaking some big rules, like posting crazy stuff like gore or threatening to hack the forums. i usually just warn people so they can avoid getting banned for smaller stuff like admitting to trolling, dismissive post, ect. even for nudity, i know that stuff can be accidental and i really think that it's better to give a person a chance to fix their mistake before you just all out tattle.