It isn't a myth. Size DOES matter, and the ladies know it. When white ladies talk about interracial sex, the main things they talk about are dick size and the intense orgasms. There is another aspect that appeals to the white slut screwing the brothas. Interacial sex often means greater endurance and more cums for her.
White guys are far less likely to say such things.
Interacial fucking is, in part, more illicit, more exciting and more satisfying to the white girl because of this. So this is why brotha balling is so addicting for the white female of most any age or marital status. She may love the boyfriend or man who treats her with so much respect, who puts her up on that pedestal to adore. She may love her man, but she will always drop her panties for a hung brotha with an insistent attitude as though he owns that fine pussy and is entitled to be cumming in it. She won't even require that he use a condom, either.