Take your pick. And if ever there was a racist comment, that was it. The fact that you read pornographic literature doesn't surprise.Oh, I get it...it was research!
"Livin' the Blues" is not pornographic literature. It is an autobiography of Frank Davis. The vast bulk of the book is just mundane experiences. There is only the occasional reference to Davis' sexual exploitations.
You must be assuming this information came from his book "Sex Rebel." Well I haven't read that entire book, but I did find copies of some pages online, and I found the section where he talks about a 13 year old girl named "Ann." She is Jamaican, not white, but a lot of people leave out that detail when they mention it as evidence.
Apart from that, you are not going to be very effective as a researcher if you can be made to balk at the fear you might find some dirty words in a piece of text. I would assume that we are all grown-ups here, and have the capability of dealing with the sordid activities of the people whom we are examining. Surely you did't think you were dealing with Rebecca of Donnybrook Farm?