Hi good afternoon Thnxs for your question I think ur vagina not fully wet at time of penis penetration in vagina may cause burning pain. For that I think u should do long foreplay that make ur vagina so wet so penis insertion will be smooth and good lubrication of vagina achieve by long foreplay.

Do Husband's semen analysis with semen culture with 3 to 6 days of abstinence. Consult ayurvedic gynecologist. Get local examination done. Cervical erosion or Vaginal dryness, infection or semen infection can cause burning. Ayurvedic medicines with hygiene regimens and irrigation of local area with herbal decoction and herbal oil soaked tampons will definitely help you.