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Ejaculation happens when the body shoots out fluid after it has been aroused or stimulated (excited sexually). Many animals ejaculate when they reproduce sexually. When a man is stimulated, his penis becomes erect. When he has an orgasm, semen comes out from the end of his penis. Semen contains sperm and other substances. How long a man can be stimulated before ejaculating, how long the ejaculation lasts, the strength of the ejaculation, and the amount of semen that comes out, all vary from one man to another. When a man ejaculates, he has a very good feeling in his penis and his groin area (the part of his body where his torso joins the top of his legs). A man can ejaculate after he masturbates or is touched by someone else sexually, or even if he is not touched (for example, if he looks at sexy pictures, watches sexy videos or thinks about sex). Ejaculation can also happen without control when a man is sleeping. Boys do not ejaculate until they reach puberty.

Scientists now think that women can also ejaculate when they have an orgasm. They think that a woman ejaculates when her Gräfenberg spot or "G-spot", which is near the front of the vagina, is stimulated, and that the fluid comes out from somewhere near the opening of the urethra into the vulva. They also think that the fluid is produced by the Skene's glands. This fluid contains glucose and fructose, which are kinds of sugars, and other chemicals.

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12y ago

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