Once you have been checked for bacterial vaginosis (if you are free of it) you could make some dietary changes to alter your vagina's smell.
Here are some things many people believe will make a vagina smell (and taste) sweeter and more pleasant:
Acidic fruits
Naturally fermented alcohols
pineapple
celery
fruit and fruit juices, especially pineapple and apple juice,
Bananas
parsley
Other fruits
quality alcohol
drink plenty of water
vegetarian diets
citrus juice
pineapple juice
celery juice
sweet melon.
high carbohydrate diet
It is possible you have bacterial vaginosis, an imbalance of bacteria in the vagina. The most common symptom of BV is odor, particularly a "fishy" smell, which often is most prominent after sex. This is because the chemicals that cause the odor are released into the air when alkali (base, opposite of acid, if you remember your high school chemistry) is added to the vaginal fluid--and semen is alkaline.
See a gynecologist, or your local health department STD or family planning clinic. Treatment is available.
Best wishes-- HHH, MD