"How come an exotic Oriental fetish such as bukkake could become so popular?"
It's rather simple, really. It's all about traditional, conservative values. And what can be more accepted or conservative than openly humiliating women who cheat on their husbands by dragging them into the public square, binding them tightly with ropes and having every able-bodied man in town shoot hot loads of thick, burbling man-sap into the offending wenches' pleading, upturned faces?
Nowadays, bukkake isn't a disciplinary action... it's a way of life! Modern, liberated young women of all races, colors and creed have awoken to the sexual potentials of this practice, and nowadays, you cannot swing a dead cat without hitting a gal who likes it directly up on the face, or directly down the throat, or in the eyes, or all over their heads, whichever way they can get it, really.