because white women are attracted to black males that defy the stereotype.
this is also true. Also, for every white woman that finds black male to be "exotic" (and thus be attracted to them) there is a black male that thinks the same about the white woman. And I know that in Europe (France/Belgium/Italy) for example, some white girls will be on some "save a brother" campaign, and that's how you get a lot of black males that are not successful at all who end up with white girls. Actually I might see more "unsuccessful" black males with white women now than successful black males, there's a new generation that is more "black-centred" now, for better and for worse.
I think it also depends on the field of work: for example I was involved in youth and voluntary work, as well as in European affairs, and I hardly EVER met a black or coloured girl in those fields, in about 6 or 7 years. So of course I ended up dating white girls because those are the ones I was meeting. Sometimes it's as simple as that.