I googled "Books about interracial relationship, fiction" and found this site.  I'm not sure if the books are specifically about black men/white women, but there are quite a few books listed so it may lead to something   http://www.librarything.com/tag/interracial+relationships  and here's another site that popped up with lists http://www.barnesandnoble.com/s/?category_id=827186%2C707