There are a lot of images on the net, most of them painted in the 19th century, of naked white women slaves being examined by non-white, generally Arabic-looking owners. The images are painted by white men. 

The idea was that a white women is more humiliated by being owned, and seen naked, by non-white men than she would be if the slave-owners and traders were white. Increasing the humiliation of the white woman made the image more erotic for white men.

At least for those white men who liked those images. Clearly, these images were popular and a lot of them were painted, so it wasn’t the taste of a small minority.