Why do I get a UTI every time after sex? How do I prevent this?

Honeymoon cystitis. This is a phenomenon observed in newly weds, who have sex for the first time and lots of it. The female urine pipe draining the urine from the bladder is comparably short, and accommodates bacteria to be pushed into the bladder during intercourse. If drinking plenty of fluids does not help, a short course (1- 3 days) of antibiotics may remedy the situation.