UTIs in men are not always STDs because they are divided into those infected with common bacteria and those infected with specific pathogenic bacteria. Common bacteria are mainly streptococcus, staphylococcus and E. coli, which are common and normal flora in the human body. In special cases, such as trauma, low water intake, and decreased body resistance, resulting in urinary tract infections, this is a common UTI is not an STD and is not sexually transmitted. In contrast, UTIs caused by specific pathogenic bacteria, such as gonococcus, mycoplasma, chlamydia, and ureaplasma urealyticum in men, are STDs and can be transmitted through sexual intercourse.