Final answer:
The basal body temperature (BBT) method is used to prevent conception by tracking a woman's basal body temperature. During ovulation, the woman's basal body temperature will increase.
Step-by-step explanation:
The basal body temperature (BBT) method is used to prevent conception by tracking a woman's basal body temperature throughout her menstrual cycle. During ovulation, the woman's basal body temperature will increase. This increase in temperature is small but consistent, and it can be used to determine when ovulation occurs and avoid unprotected sexual intercourse during that time.