In the 1920s, it was discovered that ovulation occurs about fourteen days before the next menstrual period. Based on this discovery, it was possible to calculate the best times to have intercourse to achieve or avoid pregnancy. The Calend...
http://www.contracept.org/rhythm.php
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Event listings for Rhythm Method
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Calendar-based methods - Wikipedia, the free encyclopedia
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Calendar-based methods are various methods of estimating a woman's likelihood of fertility, based on a record of the length of previous menstrual cycles. Various systems are known as the Knaus-Ogino...
en.wikipedia.org/wiki/Calendar-based_methods
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Calendar Rhythm Method - This method requires that you keep track of your cycle for a few months to determine your own individual pattern of ovulation. The pattern will help you keep track of when is most "dangerous" to have sexual intercourse.
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www.contraception.net/resource_centre/rhythm_method.asp
www.contraception.net/resource_centre/rhythm_method.asp
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Couples who do want to have a baby can also use this method to have sex during the time that they are most likely to conceive. It is sometimes called natural family planning, periodic abstinence, or the rhythm method. ... Couples use a calendar, a thermometer to measure body temperature, a kit that tests the thickness...
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kidshealth.org/teen/sexual_health/contraception/contrac...
kidshealth.org/teen/sexual_health/contraception/contraception_rhythm.html
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･ 1 First, you will need to begin keeping track of your menstrual cycles. The first day of you period (the... ･ 2 After tracking you cycles for a few months, add up the number of days in each cycle. While the average... ･ 3 Now subtract 14 ...
http://www.ehow.com/how_4619869_calendar-rhythm-method-...
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･ 1 First, you will need to begin keeping track of your menstrual cycles. The first day of you period (the... ･ 2 After tracking you cycles for a few months, add up the number of days in each cycle. While the average... ･ 3 Now subtract 14 ...
http://www.ehow.com/how_4595216_ovulation-using-calenda...
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Calendar rhythm method; The calendar rhythm method relies upon calculating a woman's fertile period on the calendar. ... The calendar method is only about 80% effective in preventing pregnancy and when used alone is considered outdated.
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www.medicinenet.com/natural_methods_of_birth_control/pa...
www.medicinenet.com/natural_methods_of_birth_control/page2.htm
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Basal body temperature method ... Mucus inspection method ... There are problems with using withdrawal as a contraceptive method. First, a man may release sperm before he has an orgasm. Secondly, a man needs self-control and a precise sense of timing to be able to withdraw his penis from the woman's vagina before he ejaculates.
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www.medicinenet.com/natural_methods_of_birth_control/pa...
www.medicinenet.com/natural_methods_of_birth_control/page3.htm
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