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The burning sensation is due to urinary tract infection
. You need to maintain cleanliness after sex acts, wash the area well with water. Pass urine after having sexual intercourse and/or oral sex
. This is the most important. Drink plenty of water. You may drink Cranberry juice as this prevents urinary tract infection and offers relief. You may go to a Urologist
and get examined to rule out any stones and also give your urine for testing which infection it is and correct medication for you.