EVERYONE I finally found a hopeful source that gives me an actual answer!
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A possible reason could be vestibulitis I think it's called. Hope this helps!
I read this answer on another site.. hope it helps you guys.
It's probably because when you have sex, the vagina can get torn (just tiny microscopic tears). If he was pulling out a lot and putting it back in, then it probably irritated the area. Guys have a lot of bacteria around their genital area, so if you did have a little tear, it would start to give a little burning sensation, and if he came inside you, probably it would end up hurting more... like if you got a papercut and someone was rubbing it really hard and then sprayed something on it.
It will go away in a couple of days when the tiny tears heal (and this is perfectly normal). Just try using a bit more lube or going at it more gently. It also helps to rinse well with water afterwards, just try not to irritate the skin more. The skin of the vagina is very delicate.
(By the way, those little tiny tears are the reason why it is much easier for women to get STDs than men... it's a direct path to the bloodstream.)
Changing what he eats only changes how his c*m tastes. It would NOT make it burn.