Sexual DictionaryDictionary of the F-Word

Vatican roulette:

Jocular American epithet, first recorded in 1962, for the rhythm method of birth-control (which consists in avoiding intercourse during the presumed period of ovulation): Vatican refers to the Catholic doctrine forbiding the use of artificial methods of contraception; roulette refers to the high risks for pregnancy when using this method of contraception.
See Also: Vatican roulette

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