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How do men and women who love each other figure out how to avoid
or achieve pregnancy?  

"The practice of systematic natural family planning is so easy to learn and use
  that a basicset of rules can be written on the two sides of a slip of paper
  the size of a business card",says the website
Natural Family Planning Basics.   

So "
a basic set of rules"

- November 18, 2001 -

How then do women figure out the date of the next period, if they are to take
  control of their monthly cycles.  I have designed a calculator hopefully
  to help them get a grip on their monthly cycles.

 Just type in the date of the first day of the current menstrual period 
in cell E6.

Here is the article "Who Needs a Period?" - By Christine Gorman, 
Time, September 18, 2000

 World Clock Time Zones

Copyright (C) Ken Matsuoka