Women who suffer from vaginal itching, burning or swelling after sex may actually be having an allergic reaction to their partner's semen, according to a report being presented today. Couples, though, might be eager to fill the surprising prescription: sex every two to three days. Allergy shots and exposure to increasingly concentrated semen samples can desensitize women to the proteins that trigger a reaction. But couples must have sex regularly for the effect to hold. Good luck and enjoy the remedy.