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In page Urinary tract infection:

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A number of measures have not been confirmed to affect UTI frequency including: urinating immediately after intercourse, the type of underwear used, personal hygiene methods used after urinating or defecating, or whether a person typically bathes or showers.[1] There is similarly a lack of evidence surrounding the effect of holding one's urine, tampon use, and douching.[2] In those with frequent urinary tract infections who use spermicide or a diaphragm as a method of contraception, they are advised to use alternative methods.[3] In those with benign prostatic hyperplasia urinating in a sitting position appears to improve bladder emptying[4] which might decrease urinary tract infections in this group.[citation needed]