I don't think black cock is inherently superior. Big cock is superior for most women, and big cock comes in all colors.
But I can admit that my dick is wildly inferior to one black cock my wife (and hundreds of other girls) took in college. The moment I realized he's
definitely superior is when I was fucking her, half hard, and asking her to think about how big he was. (Later, with me pumping, we figured out he's close to 10x7 inches, but a bit thinner than 7 for sure.) But it's not just the size that makes him superior. It's the effect of his size on her mind, years later.
While we were talking about how much bigger he was, she could barely stop herself from cumming. (And she was trying to hide it, because she didn't want me to think she enjoyed him!) Normally, it's actually pretty easy to make her cum - but if I'm not very hard, I know she won't cum. I know her body, and I know my dick wasn't going to do the job that day. Yet the mere memory of fucking his roughly 10x7 inch cock was enough to make her cum
again and again, about as much and as hard as I make her cum on my best days. This dude's dick is so good that just the thought of it makes a woman cum harder after 10+ years of separation than an undeniably huge dick on a man
she's in love with can make her cum today. (I'm usually about 8x5.75, and pump up to about 8.5x7.1 for her regularly.) If I said "[his name's] monster black cock" or asked her what it was like to feel a cock that she couldn't close her hands around when it was soft, she
gushed. Same when she told me he was too big to fit in her mouth...like at all. The tip didn't fit in her mouth. And apparently, that memory turns her on.
And again, this monster BBC pleased hundreds of women in four years of undergrad alone. I assume he had a lot more outside of that. There are literally
hundreds of other women out there either hiding the memory of this one guy from their boyfriends/husbands, or cucking them, all because this one dude has such an unbelievably huge monster cock and uses it well. Every time they hear some big dick joke or reference, his dick will pop into their minds. Some of them have and will continue to cheat with him. If not, they will be living in the nursing home one day still remembering that giant black dick they took. That's some power!
This would probably drive me crazy if not for these few things: (A) Thanks to pumping, I know that, sometimes, sizes over 6.5 inches of girth are too big for her, (B) sizes over about 8.25 inches are sometimes too long for her, and she never wants more than about 8.75 inches, (C) she genuinely loves me, and love definitely makes sex better, and (D) she turned him down when he tried to get her to cheat on me. But it still hurts to know that when she hears a reference to big dicks, she's not thinking of mine; she's getting wet picturing someone she knows who is much bigger than me.