So I suppose the general rule is "If you think it might get you banned, or in legal trouble, ask a mod/write around it/leave it out"?
Or the site in legal trouble. We're going to have a disclaimer on this opt-in that dumps the responsibility for posts and disclosures on the individual as much as possible, something that just about every forum does, but that doesn't mean the site can't get in trouble theoretically. Everything we intend to do will be geared toward avoiding that trouble.
That's been the modus operandi for our policies from the getgo. I mean, we've been bitten by Google before, no one should be eager to repeat the experience.
Edit: As to what gets one banned, I think "explicit depictions of underage sex" is pretty clear, but at the same time we're going to use our discretion on this, and that's just going to have to be acceptable. It's only come up once, and the people involved were writing about a bondage scenario involving a seven year old girl and they tried to rationalize their way out of it with legalistic mumbo-jumbo. (Note: We banned them) I realize you want hard and fast assurances, but hey, what can I say? We're not painting ourselves in a corner on this (we will now pause for cries of 'tyrants!') because, end of the day, we've only banned about eleven people off this community in the last year (minus something like thousands of spam bots) and we tend to think that this is a pretty good track record.
End of the day, once again, my recommendation is to stay well the heck away from the line separating reference to sexual abuse and the a plot that somehow venerates it or describes it in explicit detail. If we're revolted, and we're not precisely prudes, we're going to err on the side of 'keeping the Guild safe' because there's this entire community that exists here beyond one or two people crazy enough to mess around with pedophilia themes in their RP's.
We've already been through enough in the Guild thanks to people that felt entitled to activities that threatened its existence. We're through with that phase.