But did you know it doesn't just fertilise eggs, there's a whole list of things it's capable of.
On average a man produces between 80 and 300 million sperm each time he ejaculates.
Despite that, more than 60 per cent of fertility issues are related to poor sperm, according to fertility experts Dr Andrew Orr – so it's important to keep your swimmers healthy.
Apart from the downsides with fertility issues, there's a lot you might not know about sperm.
Here, Dr Orr tells us 8 facts you might not have known…
1. It helps prevent depression in women
Research has shown that women who have unprotected sex – not that I advocate this unless in a healthy relationship – or oral sex are less likely to have depression, Dr Orr told BellyBelly.
"They have healthier moods and immune systems, and are happier in general," he added.
Sperm helps increase oxytocin, prostaglandins and serotonin in women, according to The State University of New York’s study.
2. Sperm makes you more fertile
You're probably thinking "well yeah, of course more sperm makes you more fertile", but that's not what this is about.
"Semen isn’t just the vehicle for carrying sperm, it also plays a crucial role in triggering ovulation, according to a recent study," Dr Orr said.
"Scientists have discovered the protein in the sexual fluid acts as a hormonal signal to the female brain.
"This triggers the release of other hormones that signal the ovaries to release an egg."
3. You can cook with it
Yes, you read that right… cook with it.
There are actual cooking books that use semen in their recipes, Dr Orr said.
"One, for example, is Natural Harvest – A Collection of Semen-Based Recipes, where semen is described as 'not only nutritious, but it also has a wonderful texture and amazing cooking properties. Like fine wine and cheeses, the taste of semen is complex and dynamic'," he added.
We'll let you decide if you want to try that.
4. It helps a egg implant in the womb
Once sperm has fertilised an egg, it doesn't just stop doing its job there.
"Studies have shown that sperm actually assist in embryo implantation, via several chemicals and hormones," Dr Orr explained.
"Yet many people are told to refrain from having sex after IVF.
"I can tell you that you need to have more sex; ignore the BS and listen to the research that proves otherwise."
5. It's good for your skin
Sperm can help keep your skin looking healthy, but not everyone wants to smear it on their face.
"Sperm contains minerals such as zinc, vitamin C, prostaglandins, collagen, vitamins, amino acids and many other health things to benefit the skin," Dr Orr said.
"Bioforskning, a Norwegian company, has synthesised the compounds into a facial cream.
"According to Bioforskning, the cream, Spermine, is 30 times more effective than vitamin E and can delay the ageing process by 20 per cent.
6. Storing it up doesn't make it better quality
Been saving yourself so your sperm is at it's best quality when you try for a baby – sorry guys, it doesn't work like that.
Research has shown that regular ejaculation improves sperm quality and the resulting transport of seminal fluids, Dr Orr said.
Regular ejaculation also helps keep the prostate healthy.
7. Sperm doesn't last for days outside the body
Ever heard someone say that sperm can live in the vagina for a couple of days after sex? They were wrong.
"After ejaculation into a woman, most of the 300-500 million sperm that set off are dead within an hour, and only about 5-10 single sperm actually survive the journey to the tubes, where more than half of those die off," Dr Orr said.
"Sperm are killed by acids; or by the woman’s immune system; they die in the tubes; they die or get lost in the uterus, and so on.
"Only the fittest survive the race to pregnancy. Sperm might be able to last for several days – even up to 5 – but the chances of this happening are very slim."
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