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May 17th, 2011, 03:17 PM
ShawnaCAN's Avatar
ShawnaCAN ShawnaCAN is offline
Platinum Supermommy
Join Date: Aug 2006
Location: Alberta, Canada
Posts: 11,397
Rhythm isn't very reliable, so you are right to be concerned about the effectiveness. Modern types of Natural Family Planning are 96-99% effective, so higher than condoms. NFP requires monitoring your fertility on a daily basis, then every day you know if you are potentially fertile or not. There are simple rules that tell you when to abstain if you want to avoid pregnancy.
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