#natural_family_planning  any of several methods of family planning that do not involve sterilization or contraceptive devices or drugs; coitus is avoided during the fertile time of a woman's menstrual cycle
  supertype:  birth_control__birthcontrol__birth_prevention__birthprevention__family_planning  limiting the number of children born
  subtype:  basal_body_temperature_method_of_family_planning__basal_body_temperature_method  natural family planning in which the fertile period of the woman's menstrual cycle is inferred by noting the rise in basal body temperature that typically occurs with ovulation
  subtype:  ovulation_method_of_family_planning__ovulation_method__ovulationmethod  natural family planning in which the fertile period is inferred from changes in the character and quantity of cervical mucus; ovulation is marked by an increase in mucus that becomes sticky and then clearer and slippery
  subtype:  rhythm_method_of_birth_control__rhythm_method__rhythm__calendar_method_of_birth_control__calendar_method  natural family planning in which ovulation is assumed to occur 14 days before the onset of a period (the fertile period would be assumed to extend from day 10 through day 18 of her cycle)

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