I'd like to point out that my original certification proposal would allow a team to be formed to certify only articles deemed not to hurt certain sensibilities. Anyone who shares these sensibilities could add the team to his "trusted teams" list and decide to view only articles certified in this fashion. (As any censorship expert will tell you, whitelists are the only effective filters.)
While I'm against all types of censorship and consider it quite dangerous to censor sexual information in an encyclopedia, if a government mandates the use of such filters, this should be fought on the political and legal level, and not within Wikipedia. If Saudi-Arabia wants its own Wikipedia, it's probably better if they have one than if they have none at all.
The team proposal is much more neutral than any "tagging" feature. For example, another team might as well decide to select only the most instructive articles about sexual behavior etc. I would personally strongly oppose any attempt to create an exclusionary filter specifically for one type of subject ("family filter" etc.). But the team proposal seems to have no disadvantages.
See http://www.wikipedia.org/pipermail/wikipedia-l/2002-October/006816.html and replies.
As for usernames, we might need a policy there eventually, I consider TMC to be a borderline case. Individual RecentChanges filtering would also be helpful, if just to exclude bots from being listed.
Instead of complaining about the lack any of this, you can help fix it on wikitech-l.
Regards,
Erik