White women have been having sex with black men from antiquity. King Solomon of ancient Israel had a long term affair with the queen of Sheba, an ancient no longer extant country in the northeast of Africa. There is good evidence that the queen was black, and that she bore one or more offspring by him. The Ethiopians have claimed ancestry from King Solomon for many centuries. It is also pretty well known that the Caucasian wives (and daughters?) of black slave owners world wide had sex with their black slaves.
When I was a kid back in the forties there was a divorced white neighbor woman who apparently had regular sex with her black handyman, and had a baby by him. And I read and heard about white woman married to black men in years earlier, passing themselves off as white couples.
The thing is that, until modern day, miscegenation had been condemned by the majority of both white and black society, but it has become more and more acceptable as the old stigmas wane.