I agree, wannabe cucks need to get past the whole BBC thing at first, they need to just getting their wives to open their legs for any man they feel desire for, black, white, big, small, old or young...and I can promise you, watching any mans back arch and ass cheeks clench as he unloads into your wife, is hot, especially if she cums with him. After that, she's officially a hotwife, you're officially a cuck regardless of the colour or size of the other guys cock... and then see where it goes, if it does head down the BBC road, great, but if not... even watching an older white guy with a smallish cock using your wifes pussy for his own primal needs can still be pretty hot, if nothing else is on offer.
Sometimes I think getting a wife to take BBC's for the first time, is like suggesting to take up mountain climbing, and starting with Mount Everest. Small steps. Let an average Joe at a swingers club fuck her senseless and let her get a taste for being a slut in front of you, show how turned on you are, and work it from there.