Mild penile swelling after sexual intercourse can sometimes happen due to friction, minor irritation, allergy, or temporary fluid buildup and may improve with rest, gentle hygiene, loose clothing, and avoiding sexual activity for a few days. However, if the swelling is painful, severe, associated with redness, discharge, difficulty urinating, fever, or occurs after injury, it needs prompt medical evaluation. Avoid self-medicating with antibiotics or steroids without a doctor?s advice. A urologist or general physician can examine the area and decide whether treatment such as anti-inflammatory medicine, antibiotics, or other care is needed based on the cause. You can take an over-the-counter oral pain reliever like Ibuprofen (Advil/Motrin) or Naproxen. These are great because they treat both the pain and the swelling.