so far, RSS feeds are unaffected
I used an old RPG account on LJ, wrote a fairly smutty entry, and marked it as Adult Explicit. But the feed seems to be just fine. Maybe they'll do something to it later, but in the meantime, any minor could read any journal via rss without going through an age challenge. My example: mean_prof.
stewardess
It underscores what a CYA move this was, on the part of 6A. They could have easily enabled a feature that kept explicit adult content journals out of RSS feeds. But hey! Third parties aren't their problem!