rhythm method
A method of natural birth control that involves counting days of a woman's menstrual cycle in order to determine when sexual intercourse is most or least likely to result in pregnancy.
Someone who supervises workers, especially one who imposes hard or burdensome work. / (figuratively) A source of hard work or responsibility.
Alternative form of power stroke
(medicine) Dermal fibrosis resembling scleroderma and occurring in conjunction with another disease.
彼らは避妊のためにリズム法を試すことにし、性行為で妊娠する可能性が高い時期を判断するために彼女の月経周期の日数を注意深く数えた。
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