What are the natural methods of contraception

Natural methods of contraception are used by couples to protect themselves from unwanted pregnancy without the use of specialized contraceptives or medicines. These methods include the calendar method, basal body temperature measurement, Billing ovulation method, symptomatic method and coitus interruptus.

Calendar method cycles

The length of the cycle should be recorded for at least 6 months before applying the method. From the longest observed cycle, 11 is deducted to give the last fertile day of the cycle. 18 are deducted from the shortest recorded cycle to obtain the first fruitful day of the cycle.


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In a regular 28-day cycle, fertile days are from 8 to 19. In those 12 days, another method of contraception should be used or disciplined abstinence. The calendar method is also a plan for getting pregnant if you have more frequent sex on fertile days.

Basal body temperature measurement

Every day, after waking up, a woman should measure her body temperature, always with the same thermometer and in the same way (best in the mouth). Immediately after ovulation, progesterone secretion increases body temperature by 0.3 to 0.4 ° C and remains elevated throughout the second half of the ovulation cycle.


It is generally accepted that abstaining from sexual intercourse 4 days before the expected ovulation and 3 days after ovulation precludes conception. After three full days of fever, a barren period begins until the onset of the next menstrual period, so further measurement of the temperature is no longer necessary.

Cervical mucus monitoring (Billing ovulation method)

Daily evening observation of the genitals and recording changes is necessary for this method. After 4 to 5 days after the onset of menstruation, the vulva is dry until about 9-10. days, when scarce sticky mucus appears.


The appearance of mucus interrupts probably the infertile period and the potentially fertile period begins. Then the amount of vitreous, stretchy mucus grows, and the vulva is sensitive and swollen. The last day of abundant mucus is the most productive day. The mucus is then scarce and sticky. Four to five days after the peak of the onset of mucus, the infertile period begins and lasts until the beginning of the next menstrual period.

Symptothermal method (temperature measurement and mucus monitoring)

It is a combination of cervical mucus observation and temperature measurement. It gives the best results, especially if stricter criteria (longer fertility period) are applied for estimating the fertile period in case of disagreement.

Coitus interruptus

Young people often, out of ignorance or lack of readiness for sexual intercourse, apply a method known as coitus interruptus or interruption of intercourse. In doing so, the penis is pulled out of the vagina just before ejaculation, which prevents sperm from entering the vagina.

It is not a reliable method. Safety is enhanced when applied with a spermicide. Throughout the relationship, the woman can be accompanied by fear, which prevents her from experiencing her right, and the man is constantly under pressure. In addition, some seminal fluid can enter the vagina even before ejaculation, and there is no protection against sexually transmitted diseases.

But the rule applies, better any kind of protection than none, so if no other means are available, interruption can be applied.

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Contraceptives 101 (October 2020)