It's a common infection and sex, particularly rough and unprotected sex, or if it has been a while since the last time you had sex, can disrupt the normal vaginal flora. When that disruption occurs, bacterial vaginosis can happen.
This is NOT an STD
. Your partner CANNOT get it OR give it to you. This is an infection of the vagina ONLY, caused by disruption of normal vaginal bacteria.
See your gynecologist for a script for metronidazole. DO NOT drink while taking this medication.