#contraception__contraceptive_method__contraceptivemethod  birth control by the use of devices (diaphragm or intrauterine device or condom) or drugs or surgery
  supertype:  birth_control__birthcontrol__birth_prevention__birthprevention__family_planning  limiting the number of children born
  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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