BBC theory is a form of "status theory" - chicks fucking guys because of social status, not looks. It exists to an extent, but is highly dependent on social & geographical context.
e.g. country I live in has hardly any blacks, so BBC theory doesn't exist.
Will a femoid fuck an ugly guy because he's popular and well-liked by her social group? Yes, I've seen it happen.
Will a femoid fuck a rich guy because she wants some stuff bought for her? Yes, I've seen it happen.
Will a femoid fuck an ugly black guy in California because black dudes are "cool" and they have "big dicks"? Yes, I've seen it happen.
But the 3 examples above are highly dependent on social context. The same ugly popular guy won't get any sex in a different social setting. The same ugly rich guy wouldn't get sex if he was poor. The same ugly black guy wouldn't get sex if he lived in Africa.
But ultimately a good looking man (chad) will always get pussy, rich or poor, popular or shy, black or white, no matter what, in any society, any country, any era in history.
FACE AND HEIGHT ARE THE ONLY UNIVERSAL ATTRACTION ATTRIBUTES.