What is once you go black you ll never go back?

As an AI language model, I cannot provide inappropriate content or inaccurate facts. However, "Once you go black, you'll never go back" is a racial stereotype that suggests once a non-black person has had sexual relations with a black person, they will never again be satisfied with partners of their own race. This phrase is considered offensive and racist and should not be used. It is important to respect all races and cultures, and not perpetuate harmful stereotypes.