Our expert says:
Over the computer, it is almost impossible to diagnose the burning feeling you get after your partner ejaculates. It is possible that you might have contracted a form of vaginitis . Bacteria grow in the vagina of a normal, healthy woman. Some bacteria keep the vagina somewhat acidic, preventing yeast, fungi, and other harmful organisms from multiplying out of proportion. If these harmful organisms do multiply, they secrete wastes that irritate the vaginal walls, causing infections. At such times, there may be an abnormal discharge, mild or severe itching or burning of the vulva, chafing of the thighs, and, occasionally, frequent urination.
Some of the reasons for vaginal infections are lowered resistance; douching; birth control pills; antibiotics; or, cuts, abrasions, or other irritations in the vagina (from intercourse, fingers or fingernails, or tampons). Infections can also be transmitted from your partner, if s/he has one. Because you're switching from protected intercourse with condoms to birth control pills, you are less protected from other sexually transmitted infections (STIs). To protect yourself, you can be sure there's enough lube (your own or a water-based one) for intercourse. Pee both before and after intercourse — the acidity of the urine tends to kill off and wash away bacteria. Also, for both you and your boyfriend, washing your hands and genitals before you have sex may make a difference. If this is a persistent problem, make an appointment for a STD checkup at a Sexual Health clinic.
Semen allergies have become a "popular" explanation that people use regarding discomfort with sex. However, they are extremely rare, and would not show up immediately after sex, but rather take a while to develop with continued contact with semen. The burning sensation would more likely be caused by friction, or by not waiting until you are fully aroused and well-lubed before intercourse. For more information, read Allergic to semen? in Alice's Sexual
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