Hello dear, Understand your concern. It is pretty common problem in women. It generally not serious and goes its own. Following are the cause of your problem: 1. VAGINAL WALL Cervix TRAUMA due to rough sex: As 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. It can be prevented by using lubrication during intercourse. But if it is associated with pain may be due to urethral dysfunction 2.Precancerous condition in cervix/Atrophic cervicitis: Atrophied cervix get easily damage due to trauma and produce pinkish blood due to mixed with cervical mucus 3. Endo metrial dysplasia 4. Cervical polyp 5. Fibroids 6. Ovarian cyst 7. Endometriosis 8. Adenomyosis So it might be a trauma to genital tract. 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. Pelvic examination 2. Pelvic USG 3. Hysteroscopy 4. Endometrial Biopsy 5. PAP smear Use safer sex practice, use condom and lubrication during sex You should maintain hygiene and keep vaginal area dry. wash by using warm water with added salt. Wear loose cotton underwear. Take healthy diet Hope this may help you Wish you good health Best regards Dr. Sagar