However, certain factors increase the chances that these bacteria will take hold and multiply into a full-blown infection. Cystitis is often referred to as honeymoon cystitis because this bladder infection commonly occurs in women as a result of sexual intercourse. During sexual activity, bacteria are introduced into the bladder through the urethra. But even sexually inactive girls and women are susceptible to lower urinary tract infections because the anus, a constant source of bacteria, is so close to the female urethra. Some people appear to be more likely than others to develop bladder infections or repeated urinary tract infections.
Women are one such group.
Up to 20 percent will develop a bladder infection over a lifetime. A key reason is their anatomy. Women have a shorter urethra than men, which cuts down on the distance bacteria must travel to reach the bladder. Women who are sexually active tend to have more UTIs because sexual intercourse can result in bacteria being pushed into the urethra. Studies have also shown that women who use diaphragms for birth control may be at higher risk.