Ejaculation

**Ejaculation** is when either a male person shoots out liquid (ejaculate) from his erect penis or what a female human (or other mammal) ejaculates. It is also called "cumming". Ejaculation happens after the sexual organ has been aroused sexually or stimulated, or excited. It happens during an orgasm. 

Slang terms for ejaculation are blowing a load or blowing a wad, and busting a nut. creaming, cumming, jizzing, nutting, jazzing, spurting, squirting and skeeting. Ejaculation takes place when the man has an orgasm (the height of sexual excitement), usually after his genitals have been physically stimulated in some way. However, ejaculation can also happen if a man has not been touched, for instance, if he becomes aroused or stimulated (made sexually excited) by looking at sexy pictures, watching sexy videos, or thinking about sex. When a man ejaculates while sleeping, it is called nocturnal emission.

Urine can also come out with the ejaculatory fluid during sex. This is thought to be helpful in helping the sperm live in the acidic environment of the vaginal canal.

## How it happens 
Ejaculation happens during sex. It comes with fluid (seminal fluid) from the testes, and secretory (secreted) fluid sourced from glands in the prostate and penis tubes in males, and the skene's gland in females. It happens because the body wants to make lubrication to help sex as well as making pregnancy more likely.

### In males 
Before a man can ejaculate, his penis needs to be stimulated. The penis is usually soft, quite short, and hangs down. When a man is stimulated, for example by seeing another naked person, masturbating or being touched by someone else sexually, the inside of his penis fills with blood. This causes it to become longer, thicker, harder and to stand upright, and is called an erection. Men can be stimulated for different amounts of time before they ejaculate.

Ejaculation takes place in two stages.
* **First stage: Emission**. The first stage is called emission (which means "the act of sending or throwing something out"). A man's testicles make sperm cells, and these are stored in a coiled tube called the epididymis. During emission, the two ducts (tubes) called the vasa deferentia (each tube by itself is called a vas deferens), which carry sperm away from the testicles, squeeze the sperm from the epididymis to the top end of the ducts. When this happens, the man feels that he cannot stop his ejaculation. It is sometimes said that the man has reached the "point of no return". The sperm then passes through other tubes called the ejaculatory ducts, where they are mixed with fluids made by glands called the seminal vesicles, the prostate and the bulbourethral glands (also called Cowper's glands). (Glands are special body organs that make chemicals.) The mixture of sperm and fluid is called semen or ejaculate. It is white or yellowish, and sticky.
* **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.

After a man has ejaculated, his penis usually becomes soft and shorter again. He may also have an enjoyable and relaxing feeling in his groin area. It takes some time before he can have another erection and ejaculation. This time is called the refractory period. The average refractory period is about half an hour. Younger men normally have a shorter refractory period than older men. Men who are 18 years old have a refractory period of about 15&nbsp;minutes, while men in their 70s have one of about 20&nbsp;hours. Some men's penises remain hard after one ejaculation, and they are able to have another ejaculation after some time without losing their erection. Most young and middle-aged men can probably have about two to three ejaculations in a few hours, but it has been said that some men are able to have up to nine ejaculations a day.

When a man ejaculates before he wants to, this is called premature ejaculation. If a man cannot ejaculate after having been aroused for a long time, even though he wants to, this is called delayed ejaculation or anorgasmia. A man who is unable to ejaculate at all is said to have anejaculation. Some men are able to have an orgasm without ejaculating. This is called a dry orgasm.

Apart from giving a man pleasure, ejaculation may help a man stay healthy. A study carried out in Australia seemed to show that men who ejaculate often have less chance of getting prostate cancer.

When a man is stimulated, his penis becomes erect. When he has an orgasm, semen comes out from urethra (the hole in 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 in his groin area (the part of his body where his torso joins the top of his legs). A man can ejaculate after he masturbates, is touched by someone else sexually, and sometimes, even if he is not touched (for example, if he looks at pictures and videos on the internet that cause sexual arousal, or thinks about sex). Ejaculation can also happen without control when a man is sleeping, which is called a wet dream.

Boys usually do ejaculate sperm until they reach puberty, but sometimes they can masturbate (and orgasm) before it.

#### Male first ejaculation 
Young boys cannot ejaculate. A boy's first ejaculation usually happens about one year after he begins puberty, which is when his body starts changing into a man's body. Most boys go through puberty in their teens. The first time a boy ejaculates usually happens when he is asleep. This is called a nocturnal emission (which means "an emission happening at night") or a wet dream. It happens without the boy's control, often when he is having a dream about sex. When a boy begins masturbating, wet dreams usually stop happening.

## Contents of ejaculate 
### Semen
 that contains sperm.]]

Semen is known informally as *cum*, *jism* or *jizz*. Men ejaculate different amounts of semen. Normally, an ejaculation makes between 1.5 and 5 millilitres (up to one teaspoonful) of semen. More semen tends to come out if a man has not ejaculated for many days, or if he has been stimulated for a long time. Older men produce less semen. If a man ejaculates an unusually small amount of semen, this is a medical condition called hypospermia.

Semen is usually a white or yellowish fluid. It starts off being slightly thick and sticky, then after a while, it becomes more watery. Semen contains many chemicals. These include citric acid, fructose (a type of sugar), enzymes that speed up chemical reactions in the body, lipids (substances that fat is made of), and slippery fluids that help the semen to move through the urethra.

The number of sperm in an ejaculation of semen depends on many things. There may be more sperm if:
* the man is younger, ideally between 20s and early 30s
* the man exercises regularly and eats healthily
* the man is of a normal weight, as opposed to being overweight or obese 
* his body produces more of the hormone testosterone, which makes a person look and feel like a man,
* his testicles are not too warm,
* he produces more semen,
* he has not ejaculated for some time, and
* he has been stimulated for a longer time before ejaculation.

If there is an unusually low number of sperm in an ejaculation, this is called oligospermia. If there are no sperm at all, this is called azoospermia. A man with oligospermia or azoospermia is usually infertile, and cannot or finds it very hard to make a woman pregnant by having sex with her.

If a man has a sexually transmitted infection or STI (an infection that is passed from one person to another by sex), the germs that cause the disease can appear in his semen. If the person that the man has sex with touches the semen, he or she can become infected by the germs and pick up the disease. AIDS, gonorrhea, hepatitis B, herpes and syphilis are examples of STIs. One of the ways for a man to lower the chance of passing on an STI to his sexual partner is to wear a condom on his penis when having sex.

## Fertilization 
Ejaculate is supposed to help with fertilization with its contents that are not sperm. Ejaculate contains sperm, which will get the woman pregnant. If the woman is using birth control this will usually not cause her to become pregnant. Otherwise, the sperm in the semen can travel into the woman's uterus and Fallopian tubes. If there happens to be an ovum or egg cell in a Fallopian tube, a sperm may fuse with the ovum. This is called fertilization, and makes the woman pregnant. When a man has sexual intercourse with a woman, he places his penis within her vagina and moves his penis back and forth, typically in a thrusting motion, while the woman moves her hips. The vagina is warm and somewhat moist, and it places pressure on the man's penis. These sensations, combined with the friction caused by the in-and-out movements, stimulate the penis, which causes the man to have an orgasm and to ejaculate.

However, before a man ejaculates, a clear, colorless, sticky fluid called pre-ejaculate (also known as pre-ejaculate fluid or informally as pre-cum) can come out of his penis. Pre-ejaculate is produced by the bulbourethral or Cowper's glands. Some tests have shown that pre-ejaculate does not contain any sperm. However, some sperm may have been left behind in the urethra from an earlier ejaculation and the pre-ejaculate may carry this sperm out of the penis. That is why a woman can become pregnant even if the man pulls his penis out of her vagina before he ejaculates. Also, if a man ejaculates near the woman's vagina and semen falls on her body, sperm can accidentally enter the vagina and cause a pregnancy. To avoid the woman becoming pregnant when she does not want to, the man and the woman can use methods of contraception or birth control. For example, the man can wear a condom on his penis, or the woman can take birth control pills.

## References