Hey! The requirements are not set in stone, but we want to keep all conversation "only such as is good for building up, as fits the occasion, that it may give grace to those who hear." (Ephesians 4:29) Especially in the interest of younger users and those of conservative families, please try to keep things as "vanilla" as possible. I've just done some research and realized that these rules need clarifying, so I'll get back to you on specifics soon.