I don't think there's been too many problems with NSFW content here. There are a few avatars that seem out of place, but then again, even cosplay often contains content you might not want others to see (i.e. a lot of bare skin), and I don't think banning cosplay from the site would be appropriate at all. It's a bit problematic but sounds like a pain to moderate without being too harsh about it.
Keep in my I have sigs disabled though, so obviously this completely ignores them. (Last I checked, they were huge and distracting. I just checked again, and the situation seemed a lot better, but it's still pretty bad. I don't like gifs in sigs, and I especially don't like the height of some sigs.)
BTW, thanks for the tips about precise time stamps! Since most threads here have relatively short lifetimes, I never found the lack of precise timestamps a problem, but it's better this way. My favourite though? Imprecise timestamps that reveal the precise timestamp when hovered over. Obviously it's not a mobile-friendly solution, but it would be a nice addition to the current imprecise format. ;)