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- (n) natural family planning in which ovulation is assumed to occur 14 days before the onset of a period (the fertile period would be assumed to extend from day 10 through day 18 of her cycle)
- Trading rhythm for awareness t do you call people who use the rhythm method of birth control?" went the old joke.
- So far, the proposals are limited to combatting poverty and hunger, cooperating in "prudent sexual education" and popularizing the rhythm method of birth control.