having sex is one of the leading causes of a uti, especially for women. Fortunately, there are simple steps you can take to reduce your risk and to prevent getting a uti after sex. urinary tract infections, or utis, can happen a day or two after having sex. Theres a lot of conventional advice including peeing after sex thats not totally necessary for prevention. A uti can develop in men and women, involving the lower tract (bladder and urethra) andor the upper tract (kidneys and ureter). Women are more prone to getting a utiup to 30 times more likely, in factwith lower tract infections being the more common problem when it comes to having sex. what may cause a uti after sex? The urethra is the tube through which urine exits the body from the bladder. A uti after sex is surprisingly common in women and there is a very good reason why this happens. As someone who has suffered with utis (also called cystitis and bladder infections) for several years, i quickly became pretty knowledgeable on the subject. working in the laboratory and with animal models, the researchers identified a number of ways that estrogen -- the female sex hormone -- helps keep recurrent urinary tract infections at bay. bladder infections are the most common type of urinary tract infection (uti). They can develop when bacteria enter the urethra and travel into the bladder. Taking a single dose of antibiotic within two hours after having sex has been proven to reduce the chance of you getting cystitis if you are prone to getting it after sex. peeing after sex is also such common uti-prevention advice, in case any bacteria has gotten up there. That can help flush the contaminated urine out, before bacteria get the chance to.