I ordered two books. Both are written by Christian authors. The first one is "The Good Girl's Guide to Great Sex" by Shelia Wray Gregoire. The second book is written by the same author with her husband, "The Good Guy's Guide to Great Sex".
I bought both after reading an excerpt online. The women's version affirmed what I felt; the man's version, I felt like women could benefit from it also.
I know the books are geared for married couples, but I think singles can benefit from them.
I joked before, but I have to admit, yours definitely wasn't an answer I was expecting.