There are many elements included in semen like as, protein, zinc, vitamin C, water, sugar and prostaglandins. Basically, semen is a combination of the prostate gland, sperm and other bulbourethral glands in the male. As per the study, a man can ejaculate around 12 trillion sperm in his whole life. A man can ejaculate sperm in very little quantity at a time (like a 5ml of a teaspoon).