This is an american thing, if you for example get your cuckold porn from russian sites they have white people in them.
I have no idea why it has to be black either. I find both male and female niggers disgusting. Their vaginas look rotten and the males have weird faces.
Black people aren't even popular in general
"Interracial Porn Isn’t Profitable, It’s Political"
http://www.tradyouth.org/2015/02/interracial-porn-isnt-profitable/
and here in germany black prostitutes are always the cheapest ones. While you pay over 100€ for a german one you get black ones for less than 50€. Nobody likes them.
Anyway, get some non black cuckold porn from this place
http://pornolab.net/forum/viewtopic.php?t=1601021
http://pornolab.net/forum/viewtopic.php?t=1588049
http://fetish.pornbb.org/forced-bi-cuckold-cruel-wifes-t1155153.html
If you don't have a pornolab acc you can use mine
name: "n42i41g1mt2015com"
password: "Horse Table Nigger"