Gail Dines has two substantial articles on this:

King Kong and the White Woman: Hustler Magazine and the Demonization of 
Black Masculinity.  Violence Against Women, 1998, Vol. 4 No 3, (291-307) 
[also reprinted in *Not For Sale: Feminists Resisting Prostitution and 
Pornography*]

The White Man's Burden: Gonzo Pornography and the Construction of Black 
Masculinity.  Yale Journal of Law and Feminism, 2006, Vol. 18 No. 1. pp. 
283-297.

You can access versions of both articles here: 
http://users.rcn.com/gaildines/articles.htm

_____________________

Rebecca Whisnant
Associate Professor of Philosophy
Director of Women's and Gender Studies
University of Dayton