I have to agree with the other comment on this book. When I bought this book, I also bought the Shettles method book. The Shettles book is a lot clearer and uses scientific evidence, along with actual testimonials, to back up its theories. The author of this book directly contradicts what Dr. Shettles says (which doesn't make sense since Dr. Shettles can prove his theories and this guy cannot)and he offers no proof of his theories. I'm trying for a girl and even though I haven't started yet, I plan to use the Shettles method.