Rating
In general, GateMUSH is rated PG-13. This means that while violence and bad language can and will happen, they shouldn't be any more intense than what would be found in a PG-13-rated movie. Extremely vulgar language and gory violence just don't belong in the public areas of the MUSH.
That said, certain scenes or circumstances might involve some of these stronger elements. If all of the participants consent to it, certain R-rated things can be incorporated, so long as they don't involve strong sexual content.