Penis Sperm
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Penis Sperm
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Sperm are produced and released by the male reproductive organs.
The testes are where sperm are produced. The testes are linked to the rest of the male reproductive organs by the vas deferens, which extends over the base of the pelvic bone or ilium, and wraps around to the ampulla, seminal vesicle, and prostate. The urethra then runs from the bladder through the penis.
Sperm production in the testes takes place in coiled structures called seminiferous tubules.
Along the top of each testicle is the epididymis. This is a cordlike structure where the sperm mature and are stored.
The release process starts when the penis fills with blood and becomes erect. Continuing to stimulate the penis will cause an ejaculation.
Mature sperm begin their journey by travelling from the epididymis to the vas deferens, which propels sperm forward with smooth muscle contractions.
The sperm arrive first at the ampulla just above the prostate gland. Here, secretions from the seminal vesicle located next to the ampulla are added.
Next, the seminal fluid is propelled forward through the ejaculatory ducts toward the urethra. As it passes the prostate gland, a milky fluid is added to make semen.
Finally, the semen is ejaculated from the penis through the urethra.
Updated by: Kelly L. Stratton, MD, FACS, Associate Professor, Department of Urology, University of Oklahoma Health Sciences Center, Oklahoma City, OK. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.
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Medically Reviewed by Nazia Q Bandukwala, DO on January 30, 2022
The penis is the male sexual organ.
The shaft is the longest part of it. The head or glans is at the end of the shaft. The opening at the tip of the head, where urine and semen come out, is called the meatus.
Inside, two cylinder-shaped chambers called the corpora cavernosa run the length of the penis . They have a maze of blood vessels, tissue, and open pockets.
The urethra, the tube that urine and semen flow through, runs along the underside of them, in the spongy tissue of the corpus spongiosum.
Two main arteries (one in each of the corpora cavernosa) and several veins move blood in and out. Nerves relay messages to and from other parts of your body.
An erection starts in your brain . Something you saw, felt, smelled, heard, or thought makes your nerves send chemical messages to the blood vessels in your penis. The arteries relax and open up to let more blood flow in; at the same time, the veins close up. Once blood is in the penis, pressure traps it within the corpora cavernosa. Your penis expands and holds the erection.
When the inflow of blood stops and the veins open, your penis becomes soft.
When you're aroused, tubes called the vas deferens squeeze sperm from the testes toward the back of the urethra. The seminal vesicles also release fluid there.
The urethra senses the sperm and fluid mixture. Then, at the height of sexual excitement, it sends signals to your spinal cord, which in turn sends signals to the muscles at the base of your penis. These contract powerfully and quickly, every 0.8 seconds. This forces the semen out of the penis as you climax.
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Female G Spot, Prostate and Ejaculation
Why (Penis in Vagina) Sex Can Be 'Meh'
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A guide to balls. How ejaculation works, testicular cancer, ball checks, prostate gland, G spot and ‘pre cum’
This guide can only really teach you some of the basics – you might want to have a look at your own private parts (in private) to see how all this feels for yourself.
There’s a lot of variation in the size of testicles and balls. They also appear to change shape and size as the scotum reacts to pull them up into the body and to let them hang low again. There’s more on how this works below.
When the penis is aroused this also has the effect of making the balls a bit tighter. It’s thought that this is to do with the cremaster muscle (see below).
Testicles produce millions of sperm each day. Usually male bodies will have two of them. They get bigger during puberty (and the scrotum expands to allow for this) but if you have testicles they will already have dropped before puberty starts. A lot of people think that testicles suddenly ‘drop’ as a sign of puberty, but that isn’t true at all. They usually drop into the scrotum soon after birth.
It is normal for one to hang lower than the other (so they don’t bang into each other) and for one to be slightly bigger. They can swell up when sexually excited and can feel tender or a little bit sore – people call this blue balls (that’s also known as vasocongestion and it also happens to people with female bodies). This goes away after a while by itself. If you want to make that ache go away sooner you could masturbate. If that’s not your thing, maybe a cool bath or a shower might help.
They are delicate so look after them. Avoid tight pants and try and prevent them from getting hit playing sport or anything else. A number of things can go wrong with your balls. One of these is ball cancer which is very serious but also very rare. So get to know how your balls feel, so that you know if anything is unusual. They should be smooth and soft, like a hard boiled egg without the shell on, apart from the rear of each ball which will feel lumpy. Do this after a shower when your balls are hanging lower.
If you find any small lumps on your balls or if one of them has got noticeably bigger or heavier then GO STRAIGHT TO A DOCTOR OR CLINIC. Ball cancer is easily treated if caught early enough. Most of the time it isn’t cancer, just a harmless cyst. For more about this go here
The muscles inside the scrotum protects the testicles also and controls their temperature by raising them up and down. If it’s warm they hang down, if it’s cold they tighten up. This is because sperm needs to be slightly cooler (2 ° C) than body temperature.
The muscles raise the testicles up into an area called the inguinal canal. Sometimes the testicles can actually pop all the way into the body. This can happen if you get suddenly frightened by something, if you laugh really hard, or you get the shock of being really really cold (like if you jump into a cold lake). If it does happen it’s chill. Read more about the balls going up inside the body.
People produce around 1 or 2 teaspoons of cum – it ejaculates at up to 40 kph (breaking the speed limit). Around 99% of ‘cum’ is semen which helps to provide energy, and assistance for the sperm in order to fertilize an egg. It’s mostly water. Some cum is thick and sticky, some milky and some very watery. It can vary a lot. Semen’s job is to help sperm to swim but it also keeps them alive with minerals.
Sperm is created and stored in the testicles. Even though only 1% of semen is sperm there can be up to 150 million in each ‘load’ of ‘cum.’ Their role is to fertilise eggs in order to begin a pregnancy.
Some people find they have a little bit of fluid at the tip of their penis before they ejaculate. This ‘pre-cum’ is not actually ‘cum’ but a fluid which cleans the urethra.
This study suggests that some people do have sperm in their pre-cum and some people don’t. Where there is sperm in pre-cum in a minority of cases it is mobile enough to be fertile but there are much less of them than in a normal ejaculation.
If a penis was to pre-cum inside someone’s vagina there would be a risk of pregnancy, but this would be a lot less than if someone fully ejaculated inside a vagina. One of the tricky things about pre-cum is that people often don’t really know when they have fully ejaculated or not. I wrote a piece about the chances of pregnancy from having sex just once, I bet you guess wrong.
People more likely to get and give an infection from pre-cum or unusual discharge (if either partner has an infection), which is why it’s important to put a condom on before the penis enters someone.
Sperm starts it’s journey in the testicles. It then moves to the epididymis, which swells a bit before ejaculation. Then the sperm travels up the sperm tubes (called the vas deferens for you sex geeks) and then up to to the prostate. The prostate is where semen is created and here they both get mixed up. Then during ejaculation muscles around the prostate pump the semen and sperm out of the erect penis at high speed.
After ejaculation penises can’t usually get hard again for a few minutes (10 – 30 minutes, sometimes sooner, sometimes longer). This is called the refractory period and is totally normal, it’s also normal to not have a refractory period. For a lot of people this means that after ejaculation they aren’t really interested in sex for a while. However, if you do feel like you would like to continue having sex, you could — you don’t need an erection to have sex. I’ve got more advice about that here. Here’s more about ‘the hard on’.
Do leave a comment below if you have anything you’d like to add or if you have questions. I moderate all comments before they go live. Click here to ask me a question
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That’s a good question. It’s not going to feel the same for everyone and some people might start to cum before they realise. If you masturbate, you could just try to pay attention to what happens if you make yourself cum. It’s all about the muscles contracting around the prostate gland pumping the sperm and semen out. Some people know when this is about to happen, or when the muscles start to contract. But I think it’s a practice thing.
Why do my balls get smaller when i precum
That sounds like the cremaster muscle pulling your balls up closer to your body when you are aroused. As I explained in the drawings at the top of the page
How do I increase the amount of semen I shoot so that I can glaze my gf like a Krispy Kreme?
Hi Buster Gonad. I don’t think that there’s any way for you to increase the amount of semen you produce. Even though you may have unfeasibly large testicles that doesn’t really make a difference to the amount of semen you cum. Semen is made and stored in the prostate, not the balls. Some people say that if you drink more water then you might make more semen (as semen is mostly water, sound legit), so perhaps try it and see? If you and your GF wanted to glaze her like a Krispy Kreme you could also use other substances that look a bit like semen (which often happens in porn shoots). Good luck with it. Justin
My penis is quite large, but my testicles are small and lopsided. Wouldn’t the fact that I have a large penis mean that I produce a lot of testosorine and wouldn’t it be more likely to have a matching set of balls to a big cock?
Good question. I’ll try to find out.
When you pre cum do you have a chance of pregnancy
Try this page for this info Am I Pregnant
I can’t shoot cum out of my cock how do I cum
blood came out when I tried to cum . is that bad?
Yes. That might be something to see someone about. You could go to your GP (local doctor) or a sexual health service Sexual Health Services
When pleasuring hold the penis up high and quickly cum when ready. Do it slow then fast at the end. Good luck.Gerry
wow I love this, I learnt slot……..but how do I stop premature ejaculation??
very helpful but a little bit rude using “balls” and making fun of it…
Is it normal for a man to massage his prostate to prevent cancer there?
This was very very helpful thank you
It can be a good idea – particularly if you have a vagina as it can prevent some infections in the pee hole (urethra).
I find it disappointing that you seek perfection in terminology for the female explainations, but then you propogate the slang term “cum” rather than using proper terms.
Fair point. I guess I’m trying to have a mix of using proper terms and terms people understand immediately. For example ‘ejaculate’ (which would be the correct term) is both a verb and a noun.
I have same problem my right testis is bigger then left and I have no pain in it every thing is normal should I can pragnent girl I need answer beacause I am worried alot
Often/usually one testicle is bigger than the other, so that is totally fine. No need to worry. The only time to worry is if your testicle has changed in size recently, which could be a sign of a problem.
Im 14 and already knew this I’ve had sex about 11 times already this info is terrible
The information was accurate so please stop with the unnecessary and rude comments.
stupid info huh. your stupid info !
I really like this information taught me a lot about myself!
Good and valuable information given very simply and effectively with that good ol’ British wit/humor applied. Good job!
Thank you I wanted to really no thank you
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BISH is a guide to sex, love and you for everyone over 14. It’s for people who are (or are thinking about) having sex / relationships. It's for all genders and sexualities, people with disabilities, backgrounds, beliefs and values. It’s got a UK vibe so we say ‘snog’, ‘fancy’ and ‘shag’ a lot.
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