First I'm not here to judge you for I know it took you to have guts to reveal certain things you may not have wanted too but people are desperate for answers to their problems relating to this so I can understand why you came forward with the info, I believe you may help a lot of people as well.
And the answer to your question as to whether or not I duche after sex,at this time because of my relationsip with the lord I do not have sexua| relations. I know it may be hard to understand but as a born-again-believer my life belongs to him right now, but once I get married to a believer then things will change in that area.
BUT that's another subject and not to get away from the subject, from what I know when I've had yeast infections, when the women douche and still have an odor it usually indicates that you may have a type of infection present which may require you going a different route of treatment.
I usd to be prone to yeast infections a lot because I used to wear panty hose under my pants all the time for work(support stockings, now I wear ted hose) the yeast thrives on moist areas so they would tell us to wear cotton undies and to keep the area dry especially during treatment.
Sometimes at night it's good to get air there and not wear undies(if you know what I mean) even doc recommend this, but when this happened I would use a over the counter cream used for yeast infections/antifungal cream because that's what yeast infectons are used to treat them with.
Just like we use them THERE you can you the cream in the other area, because they are available over the counter. But like I said treating the area is important as well as taking probiotics with extra strains for both the large intestines is important too. I did include a link that gave info about different probiotic strains and what they do.