Hello,
Usually pain during the initial stages of penetration is due to UTI and
vaginal infection or vaginitis, a tight
vaginal wall, sores at the mouth of vagina or vestibulitis, vulvodynia or a dry vagina (frictional injury), thrush or fungal infection. Pain on deep penetration is due to pelvic inflammatory disease, endometriosis, irritable bowel syndrome, pelvic tumors, cervical and uterine infections and tumors. You should get these possibilities evaluated from your gynecologist.