Escherichia Coli: Bacteria from your perineal area crawl over to the urethra and climb up into the bladder where they multiply. Sometimes infections are associated with sex and sometimes with anatomic abnormalities. Urinating after intercourse might help. Sometimes there is a hygiene issue. In any case, if they are recurrent you should see doc and have a few things evaluated.
Answered 1/5/2019
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