I’m not so much poly and I’m stupidly overjoyed with being with my wife, so I don’t go on dates. That’s said, I’m going to treat your question with the seriousness that I’m quite sure you must have meant. I mean, you did thoughtfully use the acronym bbc to refer to a big black cock (unless you meant British Broadcasting Company which I’m having trouble understanding), so I’d imagine you are likely kind of a shy if you can’t type the word cock.
If I were dating, I’d date anyone that I’m attracted to on a physical and mental level. I’m attracted to all kinds of bodies and attitudes so the playing field is pretty large there. Your assertion that they also have a big black cock is not only crude, offensive, and pretty assaulting, but also conflates dating with sex. That’s not how it works for me.
Simply, I don’t peruse a menu of cock sizes and colors when determining who to date. I might do that if I were looking for a sexual partner, but I don’t usually eat at the kind of restaurants where they have those kinds of menus. It’s more likely that I’d want to date someone that just happened to be black and who also eventually identified their genitals with the word ‘cock’. We’d hang out, watch some movies, tell jokes, share personal stories or thoughts, throw pretzels at each other, you know what I mean … foreplay. Then one thing would lead to another and I’d eventually see what was in their pants. What I find there wouldn’t likely affect my stance on dating them. Big or small, innie or outtie, if I get to the point that I’m in your pants, I like you enough to pleasure the hell out of whatever I find there.