Bacterial vaginosis is somewhat related to the use of condoms. Using condoms for contraception can, to some extent, prevent bacterial vaginosis because it is caused by the disruption of the vaginal microecological balance, resulting in an increased vaginal pH and a mixed infection. The entry of semen into the female body can raise the vaginal pH and disrupt the vaginal microecological balance, thus making bacterial vaginosis more likely to occur. However, when a condom is used, semen does not enter the vagina, which means that it does not alter the vaginal pH balance. Therefore, to a certain extent, it can prevent bacterial vaginosis and also protect against some sexually transmitted diseases. Bacterial vaginosis can lead to an increase in vaginal discharge, and the discharge may have a characteristic fishy odor, which can cause endometritis and pelvic inflammatory disease. Thus, using condoms for contraception can, to a certain extent, prevent bacterial vaginosis.