A 21-year-old Australian has been labelled “the unluckiest man in Australia” after he was bitten by a spider on the penis for the second time in five months.

The tradesman said he was bitten by a redback spider while using a portable toilet at a work site.

It was his first visit to a portable toilet since his last encounter with a spider, he said, adding that the bite occurred on “pretty much the same spot”.

“This one is a bit sorer - it seems like it got a better shot at it this time,” he told Kiis FM Radio.

“It is a really sharp intense pain at the start… It’s redder, a bit more swollen, it hurts a bit more. I got tetanus and antivenom yesterday.”