Why are adult movies that include a black performer considered "interracial", but others that have interracial performers are not?

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It just comes down to what people want to see. Generally guys watching heterosexual porn focus on the lady and not the guy. So the video will generally be categorized by the race of the female performer.

Whereas if the guy is interested in the race of the male performer, generally they’re trying to live out a racial fantasy. So the ‘interracial’ categorization makes sense.