Why do I always get UTI's?

I dont understand why I get them so often. I got them like 5 or 6 times a year, then I got on birth control and i stopped getting them. I had maybe one. And now that im off birth control i got one 2 weeks ago after having intercourse, and now i have one again. I do everything i should do. I dont hold myself from going to the bathroom, i drink lots of fluids, i pee before AND after sex PLUS i shower to clean my self. I dont understand why this happens. Could it be that I'm allergic to condoms? I usually only get them after I've had sexual intercourse.

Anonymous2012-02-12T14:51:43Z

Intercouse

CASANOVA2012-02-12T14:52:30Z

Do you drink alot of soda, or wear tight pants, or maybe wiping wrong. Females sometimes get soap up there while taking showers.