Curate, connect, and discover
This isn't a pro censorship post, so I'm sorry if you somehow read it that way, but I think AO3 should have a toggle in Preferences to hide all sexual content on every search (can be undone, would be an account setting, all the works are still THERE just not VISIBLE if the user chooses to hide them.)
Because oh boy is it a pain to have to add a million smut tags into the exclusion filters and still have NSFW pop up no matter how many tags I put (seriously, just tag your fics, is it that hard?) Also there could be beneficial to have this idea for a sitewide NSFW filter setting automatically enabled for minor's accounts, and can't be removed until they're 18 (I understand disliking censorship, but I hope we can all agree minors shouldn't have access to smut.)
Just to clarify: It would be a setting similar to blocking accounts or filtering tags in search. It can be toggled. It doesn't censor anyone- the fics would still be there.