How come i keep getting bladder infections so often?

?Sex, ?hygiene: Could be: you don't urinate after sex and go to sleep with a full bladder, use bubble-bath or take tub baths rather than shower, wipe wrong way, don't spread your thighs when urinating + thus trapping urine behind labia, withhold urge to void, wear thongs or non-cotton underwear, are constipated or are menopausal. All or any of the above could make you prone tro utis.