How about don't open posts which have "NSFW and uncensored" in the title?
How about don't open the playboy to the nekkid pictures. Thats an effective way to not see the nudity, but how comfortable would you be using it at a PTA meeting or around a bunch of your neighbors.
I'd be uncomfortable defining Steem/it as a PTA meeting. It is a platform with a broad variety of uses (which derives its value in large part from the property of censorship resistance, something almost entirely worthless for PTA meetings).
Those who want a "PTA meeting" experience can limit their use of the platform, for example, by choosing who to follow and only viewing that feed, not the global views.