Burning after sex- only sometimes

Gabrianna
I am here because on occasion, after sex, my vagina burns badly. The most recent time was tonight. A condom was used. It began burning badly so we stopped. We thought it might be lack of lubrication. Added more, burned even worse.
This happens to me without condoms too sometimes. I thought maybe an allergy to semen or lube? 
I have had an STI exam within the past two weeks, so it isn't an STI.
Thoughts?

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