Hi It could be STD.. Partner also should be treated

Hi Fishy, rotten, or foul-smelling semen isn’t normal. Eating certain foods — like asparagus, meats, and garlic — or drinking a lot of caffeine or alcohol can make your semen smell pungent. Try limiting these foods to see if your semen smell returns to normal after a few days. If so, there’s nothing to be concerned about. If the smell persists, it could be a sign of a sexually transmitted infection (STI) or other underlying condition, such as: Trichomoniasis. This bacterial infection can cause itching and burning, as well as smelly penile discharge. Gonorrhea. This bacterial infection can cause burning when you urinate, testicle swelling, and white, green, or yellow penile discharge. Prostatitis. This refers to inflammation of the prostate gland. It’s usually caused by a bacterial infection. Symptoms include pain when urinating, cloudy or bloody urine, pain during ejaculation, or having to urinate more often than usual.