Although sexual intercourse has been established as an important risk factor for uncomplicated urinary tract infection (UTI) in women, the exact the rate of recurrent UTI due to sexual intercourse and its patient burden is unknown. According to our findings, sex-induced cystitis (SIC) accounts for almost 4% of lower urinary tract infections and for 60% of the recurrent cases. Is most frequent between 23 to 27 years and affect mainly women from low and median socioeconomic groups. Behavioral risk factors of SIC include frequency of sexual intercourse and the use of condoms, while the absence of a stable sexual companion does not add further risk. No seasonal variation has been observed in reinfections suspected of SIC. According to information obtained from our questionnaire each episode of this type of UTI in young women was shown to be associated with three to six days of symptoms and one to three days of restricted activity. E. coli was by far the most common pathogen accounting for 95% of primary UTI and 84% of recurrent SIC.