R
Ron_Conte
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The Standard Days Method (SDM) is a new method of Natural Family Planning developed by the Institute for Reproductive Health at Georgetown University. SDM works for women with menstrual cycles from 26 to 32 days long. To use the method, couples abstain from sexual intercourse on days 8 through 19 of the woman’s menstrual cycle. If a woman has more than one cycle per year that is shorter than 26 days, or longer than 32 days, the method effectiveness decreases significantly and a different method of NFP should be used.
natural-family-planning.info/standard-days-method.htm
irh.org/RTP-SDM.htm
natural-family-planning.info/standard-days-method.htm
irh.org/RTP-SDM.htm