an unprotected sex is most vulnerable to lead to STIs. the large gut(anal area) contain normal flora of E.Coli
which is a gram negative bacteria and easily transmitted to male genital orgain causing urinary tract infection
. what you have to do is have lab test known as urine analysis. if there is presence of pus cells >5/HPF or RBCs. it indicates UTI.and observe other symptoms like fever
. pain. and polyuria
i.e. increased frequency of urine.