onan·ism /ˈonəˌnɪzəm/
  交媾中斷
  onan·ism /ˈonəˌnɪzəm/ 名詞
  交媾中斷
  O·nan·ism n.  Self-pollution; masturbation.
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  onanism
       n 1: manual stimulation of the genital organs (of yourself or
            another) for sexual pleasure [syn: masturbation, self-abuse]
       2: a method of birth control in which coitus is initiated but
          the penis is deliberately withdrawn before ejaculation
          [syn: coitus interruptus, withdrawal method, pulling
          out]