Sounds like a fetish or at least a preference. Nothing wrong with that, but to characterize you dating black guys exclusively as some sort of noble pursuit makes her sound like a white savior. She's not really just finding a person who happens to be black and entering into a relationship, she's looking for a black guy, specifically to date. I'm a white guy and have dated black women, but in each case (only two), it wasn't about them being exotic or different because they were black, it was their individual personalities along with their looks that attracted me.