basal body temperature method: Natural family planning method of birth control that uses the woman’s daily body temperature to determine when a woman is ovulating and therefore fertile.

benign prostatic hypertrophy: A medical condition in which a man’s prostate gland becomes enlarged, which causes frequent urination; this condition is common with age, is not dangerous, and may be treated with medication or surgery.

bi-curious: A state of interest in sex with members of both sexes in order to determine one’s sexual orientation.

bisexuality: When men or women are sexually attracted only to members of both sexes.