Has anyone else stumbled across this post? http://caelumetterra.wordpress.com/2011/07/17/is-natural-family-planning-really-natural/
Quite a bit more negative in the NFP department than I normally see, and probably not the most healthy thread for me to read, but it was fascinating (and long!). It just had a revival a few weeks ago. I'm not sure what I think of it yet...any thoughts?