Have most white women had sex with a black man, at least once in their life?

I don't think that what you saw in a Little Mix video is evidence of anything, other than what dancers the producer chose. However, I think that video is just an excuse. Judging by your posting history, you are now adding racism to the misogyny you already have in abundance.

Aliens from outter space of course. Where have you been? Dont you get out of your house at all?

I don't know how you came up with that generalization of an entire race. There is no real basis for such a generalization. Interracial dating is probably more common now than it's ever been. In each generation it seems that it has become more common than previous generations. That's not a bad thing. Everyone should feel comfortable dating whoever they want regardless of race.