coitus in·ter·rup·tus /-ˌɪntəˈrʌptəs/
  coitus in·ter·rup·tus /-ˌɪntəˈrəptəs/ 名詞
  中斷性交
  coitus interruptus
       n : a method of birth control in which coitus is initiated but
           the penis is deliberately withdrawn before ejaculation
           [syn: withdrawal method, pulling out, onanism]