Embarrassing smells.

So I am very good when it comes to my hygiene but everytime my husband and I have sex my vagina smells weird..at first when this started happening I thought I had a yeast infection but when my doctor did a testing I didn't have anything...idk what is the cause of this smell that only Happens during sex ...it's a major turn off at times because he smells it as well is anyone else suffer from this ???