How do you get a uti?

Sex: The most common reason you get bacteria into an otherwise sterile bladder, is thru intercourse. The vaginal canal is full of bacteria, and the pumping action of sex is what can push bacteria up into the bladder, hence the common term "honeymoon cystitis." but, certainly other ways are possible if the bacteria can migrate up the short urethra.

Bacteria in bladder: Bacteria reach bladder from the anus, adhere to the lining & multiply, doubling in number every 20 - 30 mins. Can enter during sex, hence need to empty bladder after. Bubble bath & sitting in soapy bathwater irritates urethral opening & bacteria enter. Same with non cotton underwear & thongs & wiping back to front, more bacteria in area when constipated. Infrequent urination lets bacteria multiply.