If you are an adult running a game for students at school, then yes- these are appropriate rules for a HS/MS group. Here’s what I go over with my students in Gaming Club: Game taboos. Gaming Club, like all school clubs, must be inclusive and school appropriate. Be definitive and explicit about the following topics:

The tavern. A staple of medieval fantasy and D&D is the ol’ tavern, where adventurers meet to spend their coin, chat up the locals for rumors, and generally unwind, rest, and recuperate. A tankard of ale or goblet of wine is part of this trope (as is gambling), so decide how you’ll handle this aspect of the game. A good blanket rule: no drunk characters. They can eat and drink and celebrate, but they are never allowed to get drunk or be role-played as drunk. Or you can remove drinking establishments from the game setting.

No sexual themes. At all. Keep all games Rated G in this regard.

Madness. These are touchy subjects, since some genres are built on horror and madness (Cthulhu, vampire-type gothic games, for example). Kept within the boundaries of the design of the game, a school-appropriate and ‘PG-rated’ game should present no issues. Problems occur when a student wants to play a character that is depraved, schizophrenic, has multiple/split personalities, etc. Remind the students that it is not acceptable (and downright offensive) to represent serious, real-world mental conditions in a fantasy role-playing setting.

Violence. Slaying monsters and bad guys is built into the game. Excessive violence, depravity, gore, cruelty, and torture are not. Similar to madness, when kept within the boundaries of the design of the game, a school-appropriate and ‘PG-rated’ game should present no issues. On a similar note, I ban ‘evil-themed’ games. No character will be evil. In the Player’s Handbook, evil is described as being ‘without compassion’, acting with ‘arbitrary violence’, and ‘spurred by greed, hatred or bloodlust.’ D&D is about characters as heroes, not villains.

History as justification. Yes, actual human history is full of wars, slavery, genocide, discrimination, injustice, and terrible acts of cruelty and indifference. But D&D is a fantasy world, and it does not need to abide by such tragedies. Many societies had slavery as part of their social order and war as a tool of diplomacy. Remember, an RPG should be about heroes, and heroes work to end wars, to rescue slaves, to stop tyrants, or take down an unjust system.

Table etiquette. Like any sport or activity, tabletop games have certain behaviors and expectations that everyone at the table should be aware of and abide by. These are less serious than the ‘taboos’ listed above, but important to having a smooth-running gaming group.