I once heard a theory that black men prefer white women because they are more "softer" and submissive than black women....while white guys prefer black women because they are "tougher and bossier" and they prefer that, lol.

Maybe its an intellectual thing? Personally, I do have a little thing for guys of darker skin, different religion... I mean who could resist this , .
But outside things ultimately don't matter, they are just icing on the cake, its the exploration of mental diversity, compatibility of our kinks, combined with the streak of kindness that do the trick for me.

Is it a fetish...only you can answer that. But unless skin color is all that matters to you...whats the problem...is it really any different than preference for hair color?

From Wikipedia: "Sexual fetishism, or erotic fetishism, is the sexual attraction to materials and objects not conventionally viewed as being sexual in nature; the term was first introduced by Alfred Binet,[1] the psychologist better known for inventing IQ testing. Fetishism is diagnosable as a paraphilia in the DSM and the ICD, but only if the fetish causes significant distress for the person or has detrimental effects on important areas of his or her life. Many people embrace their fetishes rather than seek treatment to attempt to be rid of them."