The process of human fertilisation requires a sperm cell and an egg. During sexual intercourse, a man releases millions of sperm cells in his ejaculate, and these move up through the cervix into the fallopian tube, where a single sperm cell penetrates the egg and starts the process of life.
Every day, your testes (testicles) produce millions of sperm cells as part of a natural process of cell division. There are two types of sperm cell, those that carry a Y chromosome, which comes from your father and will produce a baby girl if it is successful, and those that carry an X chromosome, which will produce a baby boy.
When you ejaculate, the sperm cells are pumped into the vas deferens where they are miced with nutrient rich seminal fluids to create semen. At orgasm, the semen is pushed along the urethra and out of the penis.
There are three stages that are required in order for your sperm to reach a woman’s cervis. Erection, orgasm, and ejaculation. The first stage is an erection, during which a rush of blood to the penis causes it to become engorged, it becomes stiff and elevated, and much larger than normal in order to enter a woman’s vagina.
The continued stimulation of the sexual act leads to orgasm and then ejaculation. The climax is a deeply pleasurable physical and psychological state in which the body is prepared for ejaculation. There will be a throbbing sensation in the seminal vesicles and prostrate, and an awareness that you are about to “come”. This is known as the ejaculatory inevitability, and lasts from two to four seconds.
The final stage of the orgasm is ejaculation, in which the semen is forced out of the penis in a number of surges. The total umber of sperm cells in a single ejaculation can be anywhere between 40 and 150 million, all in a single teaspoon sized amount of semen. Typically the amount of semen produced is between 2 and 15 mililiters.
Following the climax comes a recovery period of several minutes up to several hours during which you are unable to have another orgasm.
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