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One ejaculation contains around 200 million sperm cells. Sperm contains more than 30 different components, including amino acids, citrate, enzymes, flavins, fructose, vitamins and several salts. Semen tastes salty and contains around 4 calories/tea spoon. Once the semen has entered the woman they need to swim some 8-10 centimetres to reach the egg. With an average speed of 18 centimetres/hour, it takes them some 30 minutes. Semen can survive 4-5 days inside a woman, patiently waiting for her ovulation.