Adult content

I understand Livejournal's Adult Content flagging system. It's a good idea for porn RPG's or LJs with pictures of nude persons to be able to lock them, or put a warning sign up, so people don't trip over things they might find offensive. I get that. So why do certain people on my flist, with perfectly good LJs, suddenly want to lock them for minors? I see the tantalising quote between brackets "You are about to view content that may not be appropriate for minors" and my stomach tingles and curiosity peaks. Shiny gems of naugthyness, I think. But what I get is what normal adults do on normal days. If those certain people think these concepts are too adult for the average minus-14 year old, let me tell you this: The average minus 14yo isn't easily shocked by concepts (s)he doesn't understand. (S)he is merely bored.
Please flag appropriate, and don't make me click through twice, so I can read your life. I prefer reading it directly on my flist.