I have a commitment to many of my major characters who have brown skin. That's a commitment to the story of a different character that you're not used to seeing in literature. In Julio Cortázar's work, for example, I can deal with his Latin American history, I can deal with the language, but his women have white, porcelain skin. They're Argentine, probably from a European background.
1991 interview in Conversations with Contemporary Chicana and Chicano Writers edited by Hector A. Torres (2007)