>I'm afraid I do not have sources to hand
Scratch that! I found one: Here's a PDF of Race and Trends in Pornography Viewership, 1973-2016, that was published in the Journal of Sex Research, Volume 56, 2019, Issue 1 by Perry and Schleifer. From the abstract:
>Analyses reveal that black Americans in general are more likely to view pornography than whites, and they are increasing in their pornography viewership at a higher rate than whites. Moreover, black men are more likely to consume pornography than all other race-gender combinations
An additional interesting tidbit about worship service attendance vs. porn viewership by race:
>frequent worship attendance only moderates trends in pornography viewership for white men. By contrast, regardless of attendance frequency, black men and women show increasing rates of pornography use
>while religious commitment is generally thought to inhibit pornography use among Americans in general, our results indicate that more frequent worship attendance seems to only moderate the pornography use of White Americans in general and White men over time.
The authors also include references to other racial pornography consumption studies, if you want to dive deeper:
>the few studies of pornography consumption that have included measures of racial identity often show similar results (Brown & L’Engle, 2009; Buzzell, 2005; Hennessey et al., 2009; Patterson & Price, 2012; Perry, 2016; Wright, 2013; Wright, Bae, Funk, 2013)
Increased consumption is not just among blacks, but all non-Whites:
>Among the studies that have included measures of race or ethnicity in their analysis, the findings have been fairly consistent with non-whites, and black Americans in particular, being more likely to view pornographic material than whites, either at all or in greater frequencies.
>found black and Hispanic adolescents were more likely to have been exposed to sexual content than whites
>being a black male or black female was associated with exposure to adult magazines, X-rated movies, and Internet pornography. Other studies using nationally-representative samples have reported similar patterns.
>non-white men and women were more likely to report viewing X-rated movies than whites, but primarily in later waves of the GSS, suggesting that this white/non-white difference in pornography viewership may be growing more pronounced over time
They also note general lack of research in this area:
>the question of how race potentially shapes the demand side of pornography―namely who views pornography and how these patterns change―has been all but ignored
The GSS has some limitations, but it is a good "big picture" view that correlates with what we hear from the back-channels of the industry itself. Much of the data that academics might need to really dive into this is locked away in private research, of course, and porn companies who hold detailed data tend not to be open or truthful about it with the public because the truth is not at all flattering.