The female urethra is 4 cm long and is much shorter than that of males.
Additionally, the female urethra is located near the anus; making it predisposed to the seeding of bacteria in the orifice.
Due to the mechanical susceptibility of the entrance to the urethra; sexual intercourse increases the infiltration of bacteria into the bladder.
Most patients who suffer from urinary tract infection report symptoms that appear after intercourse.
This fact has attracted much attention. Numerous scientific studies have unequivocally confirmed that urinating immediately after intercourse significantly reduces the risk of inflammation; this is due to the leaching of bacteria that have entered the urethra.
Statistics also prove that some vaginal diaphragms and spermicides significantly alter the composition of the normal microflora found in the orifice; contributing to the dissemination of Escherichia coli (Gram-negative rods) and increasing the risk of urinary tract infections.