#impotence__impotency  an inability (usually of a male) to copulate
  supertype:  #sterility__infertility  the state of being unable to produce offspring; in a woman it is an inability to conceive; in a man it is an inability to impregnate
  subtype:  #erectile_dysfunction__male_erecticle_dysfunction__ED  impotence resulting from a man's inability to have or maintain an erection of his penis

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