Que tipo de regra é a Regra Vermelha e de onde ela vem?

Exaltado tem, em sua terceira iteração, "a Regra Vermelha".

The Red Rule

In almost all aspects, Exalted doesn’t mechanically distinguish between Storyteller characters and those the players control. Here’s the exception:

A player-controlled character can only be seduced or otherwise put in a sexual situation if the player is okay with it. Otherwise, any such attempt fails automatically.

This is completely up to the player’s discretion, and they can waive this rule’s protection if they want their character to be seduced, if they think it would improve the story, or for whatever other reason. This is entirely up to the player, and on an attempt-by-attempt basis—waiving the rule once doesn’t void your ability to call on it later against the same character, or even in the same scene. If no one in your group ever invokes this rule, that’s also fine—but players don’t have to watch their character put into a sexual situation they’re not comfortable with.

Groups that feel comfortable in doing so should allow player characters the full range of their seductive prowess when entangled with Storyteller-controlled characters… although remember that the Storyteller is also a player and their boundaries should be respected.^{Exalted 3 Core, p222}

Esse tipo de regra é basicamente uma regra colocada no contrato da tabela de linha de base para jogar Exalted. Mas é baseado em que ninguém será forçado a suportar algo que eles não gostam. E esse conceito foi formulado em outro lugar, com algum outro termo. Tinha que fazer alguma coisa com um cartão, mas ... não me lembro.