Harm to Children: Do not include
Romance: Between players and NPCs is always fine, between PCs make sure to PM the other party before making assumptions.
Sex: Mentions of it being done / having been done are fine, though the above definitely applies here.
Homophobia: Do not include
Racism: Use discretion here. If you are unsure either talk about it in discussion or PM the GM.
Sexism: Do not include
Gaslighting: Mentions of the effects of gaslighting are okay.
Genocide: Mentions of historical events are okay.
Pregnancy, miscarriage or abortion: Mentions are okay, though lets please not make these relevant topics to the game.
Self-harm: Mentions are okay, please do not romanticize the behavior.
Sexual Assault: Do not include
Torture: Mention is okay, details should be vague at most.