Because, this board wasn't meant for kids in the first place. 18+ content really isn't all that different from 13+ content nowadays. Seriously, I've seen R rated movies be more tame then PG-13 movies. Even back in the 80's the PG (there was no PG-13 back then) ratings sometimes had things worthy of an R rating. As I said before, if she didn't want to see content she wasn't sure about, she shouldn't of joined a 13+ community. Believe it or not, some PG-13 movies even have nudity in them.
I don't think she's a bad person for wanting to stay on this forum, I just don't think it's a really valid arguement. Especially considering it wouldn't matter, because she wouldn't be able to see it in the first place, and this problem can also be solved by hiding the board. On TLKP you won't even know the adult board is there until your old enough to view it.
[quote="TheGunner18"]Personally, I don't mind what happens at all with this adult board. The only thing I'm concerned about with the 'The staff pick members who they think are mature enough' method, is that if people don't get picked, they might feel left out and a bit, well, annoyed, to say the least. That's just me being picky, though.

[/quote]
It's the same issue with the Member Rooms. But I've only seen someone have an issue of it once.