P.S. Try this book, maybe. I haven't read it, since I'm obviously straight, and it doesn't seem like a good use of my time.
I will say though, that he wrote one on cunnilingus which was pretty good. I thought was pretty good before, and I am, but even I was able to pick up one or two skills from that book, and they made complete sense, fitting in precisely with my past experiences.
I recommend Passionista. It's a fun read with a lot of great ideas for women.