Adults-Only Boards

[theglobe]

OK, I'm wondering if there is a mod that will allow certain boards, such as an adults-only board, to remain invisible to the user unless they want to see it? Like a user option on their profile or whatever to only see the board if they want to. Right now, the adults-only board is showing up on the portal and I don't want it there, even though it's only users that are 18 and over that can see it.