other extrinsic factors that can contribute to UTI include carheters, especially short-term indwelling catheters, and administrtion of antimicrobial agents. Antimicrobials alter the host's normal perineal flora, allowing easier colonization of uropathogens. Tight clothing or diapers, poor hygiene, and local inflammation,such as from vaginitis, masturbation, or pinworm infestation,may also increase the risk of ascending infection. The essential oils in bubble baths and shampoos can irritate the urethra of both boys and girls,causing painful and frequent urination.Therefore bubble baths are discouraged. There is no evidence that plain tub baths increase the risk of UTI,but infection have been related to the use of hot tub r whirlpool baths. Sexual intercourse may produce transient bacteriuria in females and is associated with an increased risk of UTI