Postcoital or after sex bleeding can be alarming at first, not to mention a real mood killer. And if your doctor doesn't make the conversation easy for you, maybe you should think about finding a new one. Do you use any sex toys or other foreign objects during sex? Anatomically, the two parts of your body that can bleed from the friction or relative trauma of vaginal sex are your vagina and your cervix. An Overview of Cervical Ectropion. Typically there's a limited amount of bright red blood. You've had unusually rough sex or a foreign object is used for vaginal penetration.