- A rhythm approach to natural birth control.
- all-natural family preparation in which ovulation is thought to occur fortnight ahead of the start of an interval (the fertile period would-be thought to increase from time 10 through day 18 of her cycle)
- A rhythm way of all-natural birth-control.
- normal household planning for which ovulation is believed to occur 14 days before the onset of a period (the fertile period would-be believed to give from time 10 through time 18 of the woman pattern)
Hypernym for "calendar method"
- natural family planning
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