1. 
   Periodic abstinence
   Periodic abstinence: Also known as fertility awareness, natural family planning, and the rhythm method, this approach entails not having sexual intercourse on the days of a woman's menstrual cycle when she could become pregnant or using a barrier method (such as a condom, the diaphragm or a cervical...
   Found op http://www.medterms.com/script/main/art.html?articlekey=9771
   
   
2. 
   Periodic Abstinence
   Abstaining from sexual intercouse for a few days before, during, and after the expected day of ovulation for birth control purposes. Synonym(s): Natural Family Planning Rhythm Method
   Found op http://www.pregnology.com/AZ/P/4
   
   

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