Which isn't very fulfilling for most ladies.   Just speaking as a lady.  You know when I don't want to have sex - when I am a PMS'ng bloated mess.  Probably even more difficult if you are not on anything.  

And you are equating using one form of contraception over another to nuclear warfare.  This is exactly the issue that us "normal" Catholics have with the NFP zealots.  Nuclear warfare leads to mass murder and destruction.  Choosing one form of contraception over another is a prudent and private choice made by couples.  No one is being harmed by this.