Nexus, where I am at in the South, I hardly see any IR couples. You're right that African American males are famous in sports and music, but I do not think this translates into increased dating success. The media presents such men such as Brad Pitt or Tom Brady as the best-looking men in the U.S. with blue eyes and certain other features.
Also, while AA men may come across as the most masculine and confident men in the world, many white, Asian, and Latino women will not give them the time of day because of racist mindsets in the U.S. The women may face a backlash from their community and it takes a lot of a strength for that woman to cross the color line. As a Latino guy, I wish the U.S. were more open and all these stereotypes, disadvantages, and problems associated with being a person of color were not present. But the problems are there, and so majority women are discouraged from pursuing their desires.
Now in Europe (outside of the UK), black and Latino men absolutely dominate. However, there are not so many minorities in Europe that they are a threat to white men. But WW in Europe are aggressive, and there are not negative perceptions associated with darker skin in Europe. If given a choice between a standard, boring white guy and an exotic minority, many WW in Europe (outside of the UK) would go for the minority. Ironically, many white men in Europe also prefer African women as well so it all works out. I need to get the hell out of New Orleans.