#birth_control__birthcontrol__birth_prevention__birthprevention__family_planning  limiting the number of children born
  supertype:  planning  an act of formulating a program for a definite course of action; "the planning was more fun than the trip itself"
  subtype:  coitus_interruptus__withdrawal_method__pulling_out__pullingout__onanism  a method of birth control in which coitus is initiated but the penis is deliberately withdrawn before ejaculation
  subtype:  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
     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)
  subtype:  contraception__contraceptive_method__contraceptivemethod  birth control by the use of devices (diaphragm or intrauterine device or condom) or drugs or surgery
     subtype:  oral_contraception  contraception achieved by taking oral contraceptive pills
     subtype:  surgical_contraception  contraception by surgical sterilization
        subtype:  tubal_ligation__tuballigation  a sterilization procedure with women; both Fallopian tubes are tied in two places and the tubes removed in between the ligations
        subtype:  vasectomy  surgical procedure that removes all or part of the vas deferens (usually as a means of sterilization); is sometimes reversible

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