Is there a way to find out why did i bleed after sex?

Eval: There are many possible reasons for bleeding during /after sexual intercourse. ** menopausal women may have atrophic vaginitis with decreased vaginal secretions & thinning of vaginal mucosa. ** some sexually transmitted diseases like chlamydia, gonorrhea, or trichomoiasis ** endometritis.** endometriosis** adenomyosis**erosion (inflammation) of the cervix ** uterine polyps** see below:.