My girlfriend and I have an active sex life and we regularly have protected sex but we do have unprotected oral sex almost all of the times. My problem is that my girlfriend always has mouth blisters after the day we have oral sex. Is it because of the oral sex? Should I be concerned? Can I have some infection that passes on to her through oral sex? Do i need some tests? If yes, then please tell me which ones. I really want to know what causes this. Please provide relevant answers.
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