Whenever it's a ''white man and black woman'' relationship/marriage, what's the reason behind it?

For instance these rich, white men didn't just date but marry a black woman, is there any reason behind it? I know why a black woman can go after a white man but assuming that he asked her out on a date, asked her to be his girlfriend and then proposed... what's the reason a white man (esp if it's one with many options) goes after a black woman?

Example of the ''white man and black woman'' combination.

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I'm curious though. How did they (the black woman) landed a white man? What's the reason a white (with many options) man selects black woman?
Whenever it's a ''white man and black woman'' relationship/marriage, what's the reason behind it?
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