My husband always complains about a smell from my vagina, and often i notice a thick white discharge. but tests for yeast or b.v are always negative.

It's just chemistry: If you have been tested for overgrowth of yeast or bacteria and no pathology has been found, i would have to surmise that this is just your natural smell. Think about taking a deep whiff of a handful of anybody's hair - everybody has their own genetically-programmed aromas (everywhere). The discharge bothers me a little bit, though; i would not recommend douching. Hubby needs a chill pill.