Inclusion Criteria:  Female university ROTC cadets, military veterans attending, police officers, and firefighters. 18-34 years of age or older (premenopausal) Have a 21-35-day menstrual cycle No changes in hormonal contraceptives within the last three months No current UTI symptoms Sexual activity and inactivity  Exclusion Criteria:  Males Under 18 years of age or over 34 years of age Pregnant or nursing Menstrual irregularities effecting having a menstrual cycle to be between 21-35 days Progesterone-only contraceptive use (combined estrogen-progesterone and non-hormonal IUDs are okay) Currently taking antibiotics On hormone replacement therapy Currently experiencing symptomatic vulvovaginitis Diagnosed with recurrent UTI Not volunteering to participate