The food thing seems hit or miss-you're still going to taste like vagina, because that's what vagina tastes like for the most part.

Try showering immediately prior to sex. Vaginal fluids when aroused are almost like water, not thick and creamy. The "vagina smell" comes from non-aroused fluids.

I kinda have a similiar fear, although in my case, it's not how it tastes, because I know I do not taste bad, but rather, a small fear that smegma will be down there, so I'm pretty anal about wanting to only have sex if I've showered recently-within a few hours prior.