Our expert says:
It is unlikely that an STI would present so suddenly. From what you describe it sounds more probable that you may not have been as lubricated during sex, and if the sex was vigorous and extensive you could have been chaffed due to friction.
Woman are also prone to a variety of infections. It is possible that you may have had an underlying infection that was aggravated by the sexual encounter.
I suggest you see your doctor for an examination.
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