Why do i discharge vaginal blood after sexual activity?

Inflamed cervix: Your cervix may be inflamed and therefore the act of sex can make it bleed. If the sex was not painful, then trauma causing damage is unlikely. An inflamed cervix can bleed with even very gentle bumping. We this often during an annual well woman exam when the cervix bleeds from even a pap smear or a q-tip. Cervical cancer can cause the same problem. Time to get a check up from your family doc.