My ex wife was what I would refer to as semi prejudice when we first got married. I say semi, because she really had no interest in blacks or physical interests in black men out of never being around them. Grew up in predominately white small town. When she first moved to a military town to marry me, she was quite uncomfortable with the vast amount of IR couples in such an environment.
Long story short, in just two years of marriage, she had a whole different perspective of black men after cheating on me with her first! So to answer initial question, IR in general in helping erase predujice while also introducing more white women to the intense ultimate pleasures of BBC fucking!!!