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When i was married to my ex, i would feel a burning/stinging sensation. My reason was because foreplay wasnt long enough, he had a large penis, and so i wasnt fully relaxed so the lubrication and muscle relaxation wasnt there...make sure she is relaxed and talk to her whilst making love, ask her "are u ok?" and she should relax more IF thats the problem. No women want a WHAM BANG thank u maaam ...good luck
She did see the doctor, had herself checked nothing really is the matter, she forgot to ask about that sympom.
Tell her to see a doctor.