Excuse me for butting in, but I couldn't resist sharing about a wonderful book I found called Your Fertility Signals, by Merryl Winstein! In it she explains very clearly how to use our (women's) amazing and awe-inspiring natural processes to avoid or achieve pregnancy. I hated all the unnatural methods. Our bodies send very clear messages about so many things, including fertility. It takes a little practice, but it is well worth it, I think!