What are the "security systems put in place to prevent distasteful actions between players" in that case? Rather, what is a distasteful action that doesn't fall into above categories?

As for player relations, I'm gonna do some brainstorming (most of you know this amounts to a light rain shower at best), but I still think the easiest way to have everyone connected ahead of time is through some online forum or chatroom. However it's also possible that the party could know each other like a chain? For example Character A is friends with B and C. B is not friends with C but knows D and E, etc. from there...? So it wouldn't be necessary for [i]everyone[/i] to know one another as long as there is a string of acquaintances...?