Only a few people will probably get this one, so this needs some explaining.
I recently read an article about skin color as a fetish. It's common knowledge that people can be attracted to a certain ethnicity, and it's acceptable for white people to want to be dominated by someone of a different skin color, and for others to want to dominate a white person.
But a fairly large underground group of both black and white people are into white master/black slave role play, especially in America where it's a big taboo and everything taboo will always turn someone on (Nazi role play is more popular in Europe). These people fit together and compliment each other like any other S/M relationship, where both parts have agreed and it's all consensual, so no harm done.
Still, role play like that would be considered evil by other people, so I thought "Peter has got to have that fetish, and of course he'll take it to levels where even the people who are into it will find it offensive"