When semen squirts from a male's penis during an orgasm. Usually only a teaspoon or tablespoon comes out at a time. About 500 million sperm come out with the semen. This can happen when he has sex, when he masturbates or even when he is asleep (wet dream). If a male doesn't EJACULATE during sexual contact, he will not be harmed. A male can EJACULATE with or without having an orgasm. It is not the same as urinating. Urinating and EJACULATION cannot happen at the same time.