Ejaculation
Second stage: Ejaculation proper. The second stage is called ejaculation proper (which means "real ejaculation"). When ejaculation properly begins, the man starts having an orgasm. A muscle at the base of the man's penis called the bulbospongiosus muscle squeezes strongly again and again. This forces semen to move from the ejaculatory ducts into the urethra, which is a duct that passes right through the penis. Semen is pushed along the urethra until it shoots out of the end of the penis in spurts. Once the muscle starts to squeeze, the man cannot stop the semen from coming out of his penis. During an orgasm, the man's muscle will usually squeeze about 10 to 15 times. The squeezes happen very quickly. They start at about 0.6 second apart, then slow down and become weaker. Most of the semen is ejaculated in the first few squeezes. How strong an ejaculation is varies from man to man. For some men, the semen shoots out of their penis very far, while for others it dribbles out. It is very bad if semen gets in an eye. The enzymes semen contains to penetrate the egg in a female will also attack the eye. Be careful not to ejaculate toward your eyes or your partner's eyes. An ejaculation is often stronger if a man has been stimulated for a longer time. The squeezing of the man's muscle gives a very good feeling to his penis and his groin area (the part of his body where his torso joins the top of his legs). A man's orgasm usually lasts about 17 seconds, but some men have an orgasm for only a few seconds while for others it can last for up to one minute.