natural family planning
(transitive, intransitive) To act or move like a ninja, particularly with regard to a combination of speed, power, and stealth.
plural of giant oarfish
Timing sexual intercourse to avoid the time of ovulation (if pregnancy is not wanted) or to fall within that time (if pregnancy is desired).
One who shares the same tomb.
彼らは、生理周期を記録して受精可能な日を避けたり狙ったりするために性交の時期を調整する方法を試すことにした。
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