American Board of Family Medicine (ABFM) Practice Exam

Frequent sexual intercourse is the most common risk factor associated with uncomplicated cystitis, particularly in women. This association is largely due to the anatomical proximity of the female urethra to both the vaginal opening and the rectum, which allows for the introduction of bacteria into the urinary tract during sexual activity. The mechanical irritation caused by intercourse can also contribute to the invasion of bacteria that lead to urinary tract infections (UTIs).

While each of the other options may have some relevance to urinary tract health, they do not have the same direct and frequent association with uncomplicated cystitis as sexual activity does. Diabetes can predispose patients to infections due to immunosuppression and decreased bladder contractility, but it is not as commonly a leading risk factor as sexual activity. Similarly, antibiotic use can alter the normal flora of the urinary tract, potentially contributing to the risk of infection, but again, frequent sexual intercourse remains a more predominant risk. A history of renal stones may complicate urinary health and contribute to infections, but it is not a prevailing risk factor for uncomplicated cystitis specifically.

Thus, the evidence strongly supports frequent sexual intercourse as the primary risk factor for developing uncomplicated cystitis, especially among women.