Given the symptoms you reported (milky vaginal discharge after intercourse without foul smelling), you might be experiencing bacterial vaginosis.
Bacterial vaginosis is a condition in which an inflammation of the vagina due to bacterial infection is present. Depending on the type of the bacteria bad odor might be present. The vaginosis is often accompanied with itching. The transmission is usually via sexual intercourse, although other ways of acquiring bacterial vaginosis have been reported, too.
You might want to visit your gynecologist and have a PAP smear or at least a vaginal swab which might reveal the presence of bacteria. The exact bacteria might be detected. If the swab is used for an antibiogram then the most effective antibiotic against that certain type of bacteria might be identified.
It is important to have your partner tested at the same time. If infection (urethral or urinary) is detected then he should go under the same treatment for the same period. Avoiding sexual intercourse would prevent reinfection to the one who is cured first.
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