Do you think you know everything about sperm? We bet there are things you have never heard about.

1. The average man produces 1,500 sperm cells a second. However, it takes about two months for a sperm to go from being created to being able to fertilise an egg. Sperm growth is like a constant production line in a man's testicles.

2. Men produce sperm all day, every day, every day of their lives. Meanwhile, women are born with all the eggs they'll ever have.

3. If a man could get all his sperm from one ejaculation to line up end to end he’d have a line six miles long.

4. Not all sperm swim in a straight line. In fact, only about 50 per cent know where they're headed. The others swim around in circles, or just go with the flow.

5. A man's body keeps sperm at a temperature three and a half degrees celsius lower than the rest of his body. To help keep sperm cool, don't work with your laptop in your lap, despite what it's called.

6. Ninety per cent of the sperm that leave the body are deformed. They could have two heads, two tails, or the wrong shape tail.

7. Only one sperm from the 200 million produced per ejaculation will go on to fertilise a woman's egg.

8. The average ejaculation would fill half to two-thirds of a teaspoon, and contains about seven calories.

9. A sperm doesn't have to be alive to fertilise an egg. When babies are made the old fashioned way, sperm need to be able to swim up to the egg. However, if an egg is fertilised using IVF technology, the sperm can be dead and still do the fertilisation deed as all the egg is interested in is the DNA inside the sperm.

10. Sperm can live inside a woman's body for up to five days.