coitus interruptus:

Or: interrupted-coitus , a doubtful contraceptive method consisting in withdrawing the penis from the vagina before ejaculation . Although it is the oldest known form of contraception, withdrawal is unreliable as a birth-control method; it is considered, at best, 75% effective because seminal-fluid may be emitted without sensation before ejaculation . In Australia, it is called: getting-off at Redfern , in Britain: getting out at Gastshead , the Irish and Irish Americans say: to leave-before-the-gospel .
Etymology: From the Latin coitus , copulation , and interruptus , interrupted.
Synonyms: French-method ; interrupted-coitus ; onanism ; pulling-out ; withdrawal-method .

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