Author E L James holds a copy of her new erotic fiction book "Fifty Shades of Grey" at a book signing in Coral Gables, Fla., Sunday, April 29, 2012. Photo: AP/Jeffrey M. Boan
The track, from the 2003 album "Elephunk", features lyrics like: "For you I'm a fanatic, I'm an addict, your sexy antics turn me on like automatic."
James confessed her musical tastes at the launch of her " Fifty Shades" classical album.
She added that part of the books' success was that the covers are "discreet", allowing fans to read them anywhere.
She said, "I designed the covers because in my early 30s I read a lot of romantic fiction when I was slogging in and out of London on the Tube. But they had these horrible covers with women with clothes falling off.
"I hated that and I had to bend the covers back. So I designed really discrete covers so that no one would ever know it is salacious."