Hello dear I understand your concern swelling in the vagina after sex could be a rough sex, vlvovaginitis or vaginal infections. I advise you to consult the gynecologist and undergo vaginal examination, vaginal swab test to diagnose above cause. Doctor will give following advises: use vaginal suppository of clingen. Wash the vagina with warm salted water and then apply apple cidar vinegar. You can also take warm water sitz bath. Wear pure cotton loose underwear. If swelling is sever then short term use of prescribed mild steroid can be useful. Wear pure cotton loose undergarments. take healthy diet and drink lots of water Hope this may help you Contact HCM for further health query Best regards Dr. Sagar