Hello dear, Understand your concern. I think pain is mainly due to rough sex that damage the genital tract due to friction. It may be due to hymen injury. Causes are below 1. VAGINAL WALL TRAUMA: it contain atrophied endothelial lining of vagina. so little blood due to trauma mix with cervical mucus form it pinkish colour It indicate disturbance in blood vessels integrity Sexual intercourse precipitate microfissure and frets in vessels lead to bleeding and caus pain It can be prevented by using lubrication during intercourse. 2.Precancerous condition in cervix 3. Endo metrial dysplasia 4. Cervical polyp 5. Rough sex 6. Fibroid and adenomyosis So it might be a trauma to vaginal wall. You should maintain hygiene and keep vaginal area dry. wash by using warm water with added salt. Wear loose cotton underwear. Use condom and lubrication during sex. Insert penis once vagina get fully wet. Tablet meftal spas for pain 2-3 times per day. Apply cold pad Ointment hydrocortisone if looking sever But if it will not respond you should consult with gynecologist to exclude precancerous condition and infection(STD: bacterial vaginosis an chlymadia) Do the following test: 1. PAP smear 2. Gram stain and Culture from discharge 4. PCR and nucleic acid amplification test to exclude STDs Hope this may help you Wish you good health Best regards Dr. Sagar