Mary,
I don't want to get into an endless debate, nor do I disbelieve you. But I have an alternate viewpoint.
Yes, it's true that Blacks appear to win the size race on the average, at least from our 'casual' POV. But we also 'select' for size. Please consider that larger Black men are probably more prone to become involved in this lifestyle due to their enhanced potential for success. I don't believe that many Blacks sporting a thin five inches would be very active, and if they tried, they wouldn't be very successful, at least not in comparison to a man who had a thick seven inches to his credit. So I contend that smaller Blacks would weed themselves out of this lifestyle pretty quickly.
Also, the porn industry actively selects for larger Black men, to feed the mystique. No one - men and women alike, wants to see a smaller black man with a white woman, so the industry seeks out larger men, perpetuating the myth that ALL Blacks are seven or larger. I know you don't believe that ALL Blacks are larger, I'm just trying to support my argument.
So, given that the majority of Black men in this lifestyle (on adult dating sites / glory holes / etc) are larger, coupled with the very successful efforts of the porn industry, it's easy to understand the false impression that the majority of Blacks are larger.
In contrast to this, the solid research I've found on the subject suggests that the AVERAGE Black runs about 1/4 of an inch larger than the AVERAGE white guy. Don't know about you, but I can't tell the difference between 1/4 of an inch!
Finally, one last point. Blacks have less erective tissue than whites. Let me explain... The difference of ration in size between a flaccid and fully erect Black man is relatively small. In other words, a flaccid Black man may measure just under six inches, but when fully erect, he measures seven inches. Conversely, a flaccid white guy may measure four inches, but when fully erect, could measure 6.5 inches. This is an important consideration.
Guys in a locker room look, at least according to my husband they look. Guys look at Blacks and see a full 5.5 inches swinging between their legs and ASSUME, based upon their experience, that the cock must grow to a huge length. They think that Blacks have the same expansion ratio as Whites do. So, without actually seeing the Black man fully erect, the myth is born.
Mary, please understand that I'm not arguing with you in the least. I'm just offering a counter-point to your statement above. Remember that perception is always 100 percent correct to the perceiver!