A MAN has received the world's first sperm-making stem cell transplant in a groundbreaking experiment to reverse infertility.

Jaiwen Hsu, 26, has azoospermia , a condition where no sperm is present in the semen , leaving him unable to father a child.

Azoospermia affects around one per cent of all men globally - or 500 men in every 50,000, according to research .

The often devastating condition is caused by hormonal dysfunction , blockages in the reproductive tract, or genetic conditions .

Even something as simple as using the heated seat function in a car can lower sperm production.

In this case, Jaiwen's infertility was caused by chemotherapy he received as a child to treat bone cancer , which can take a toll on the reproductive system.

For this clinical trial, doctors

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