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To counter this gap in education, Kassel encourages people who use withdrawal to also track their ovulation windows and basal body temperatures in order to avoid sex without a barrier during their fertile days.

Six years ago, the Health Resources and Services Administration added to its ACA guidelines the fertility-awareness method, which is used to help women avoid pregnancy or become pregnant by tracking markers such as basal body temperature, cervical mucus and hormone levels.

Meanwhile, I monitored my basal body temperature, weighing motherhood against the seriousness of our courtship.

Some offer to track additional data including basal body temperature, sleep patterns, menstrual pain and sexual activity, which can provide further clues - although there have been concerns around what else this data can be used for by the developers of the app.

Right now, the app is only cleared to be used as birth control with a basal body temperature thermometer, which tracks smaller temperature increments than a regular thermometer.