Fishy odor after intercourse, this phenomenon is mostly considered to be due to bacterial infection caused by vaginitis. Bacterial vaginitis is mainly manifested in the leukorrhea with yellow, green, and some fishy odor, itching and other phenomena. You can go to the hospital to do routine examination of the leukorrhea, vaginal medication, you can use some metronidazole drugs, you can also men and women at the same time treatment. Usually pay attention to the cleanliness of the vulva, wash every day, wear some cotton breathable clothes, keep the local clean. More outdoor exercise to improve immunity and reduce recurrence. Generally a week of medication can be cured, it is recommended to use another week of medication after the next menstrual period to consolidate the treatment of bacterial vaginitis.