The site is already pretty mature in manner. The whole forum is full of mature posts. I'm not sure what kind of thing you'd like to post that'd require an 18+ forum, unless it's the obvious one -- porn. Either that or you feel an overwhelming urge to curse?
I think you might be looking for a juvenile sub-forum, not a mature one.
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"An adherent of homeopathy has no brain. They have skull water with the memory of a brain."
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