The World of Darkness RPG Consent Checklist is a great tool for players and Storytellers to make a gaming enviroment in which both the players and gamemaster feel comfortable and safe. Unlike the X-card which is designed to do something similiar, this product is proactive instead of reactive, helping plan out where the Roleplay will and can go ahead of time.

The Tabletop Gaming Club finds this a very useful tool and recommends it to everyone..

Simple but effective.